diff --git a/src/function/algebra/simplify.js b/src/function/algebra/simplify.js
index f6f0320a3..a5f33b54c 100644
--- a/src/function/algebra/simplify.js
+++ b/src/function/algebra/simplify.js
@@ -327,7 +327,9 @@ export const createSimplify = /* #__PURE__ */ factory(name, dependencies, (
 
     { l: '1*n', r: 'n' }, // this pattern can be produced by simplifyConstant
 
-    { l: 'n1/(n2/n3)', r: '(n1*n3)/n2' }
+    { l: 'n1/(n2/n3)', r: '(n1*n3)/n2' },
+
+    { l: 'n1/(-n2)', r: '-n1/n2' }
 
   ]
 
diff --git a/test/unit-tests/function/algebra/simplify.test.js b/test/unit-tests/function/algebra/simplify.test.js
index fb8a471e5..a964f57b7 100644
--- a/test/unit-tests/function/algebra/simplify.test.js
+++ b/test/unit-tests/function/algebra/simplify.test.js
@@ -388,4 +388,44 @@ describe('simplify', function () {
     simplifyAndCompareEval('log(3,5)', 'log(3,5)')
     simplifyAndCompareEval('log(e,9)', 'log(e,9)')
   })
+
+  describe('should simplify fraction where denominator has a minus', function () {
+    it('unary numerator and unary denominator', function () {
+      simplifyAndCompare('1/(-y)', '-(1/y)')
+      simplifyAndCompare('x/(-y)', '-(x/y)')
+      simplifyAndCompare('(-1)/(-y)', '1/y')
+      simplifyAndCompare('(-x)/(-y)', 'x/y')
+    })
+
+    it('binary numerator and unary denominator', function () {
+      simplifyAndCompare('(1+x)/(-y)', '-((x+1)/y)')
+      simplifyAndCompare('(w+x)/(-y)', '-((w+x)/y)')
+      simplifyAndCompare('(1-x)/(-y)', '(x-1)/y')
+      simplifyAndCompare('(w-x)/(-y)', '(x-w)/y')
+    })
+
+    it('unary numerator and binary denominator', function () {
+      simplifyAndCompare('1/(-(y+z))', '-(1/(y+z))')
+      simplifyAndCompare('x/(-(y+z))', '-(x/(y+z))')
+      simplifyAndCompare('(-1)/(-(y+z))', '1/(y+z)')
+      simplifyAndCompare('(-x)/(-(y+z))', 'x/(y+z)')
+
+      simplifyAndCompare('1/(-(y-z))', '1/(z-y)')
+      simplifyAndCompare('x/(-(y-z))', 'x/(z-y)')
+      simplifyAndCompare('(-1)/(-(y-z))', '-(1/(z-y))')
+      simplifyAndCompare('(-x)/(-(y-z))', '-(x/(z-y))')
+    })
+
+    it('binary numerator and binary denominator', function () {
+      simplifyAndCompare('(1+x)/(-(y+z))', '-((x+1)/(y+z))')
+      simplifyAndCompare('(w+x)/(-(y+z))', '-((w+x)/(y+z))')
+      simplifyAndCompare('(1-x)/(-(y+z))', '(x-1)/(y+z)')
+      simplifyAndCompare('(w-x)/(-(y+z))', '(x-w)/(y+z)')
+
+      simplifyAndCompare('(1+x)/(-(y-z))', '(x+1)/(z-y)')
+      simplifyAndCompare('(w+x)/(-(y-z))', '(w+x)/(z-y)')
+      simplifyAndCompare('(1-x)/(-(y-z))', '(1-x)/(z-y)')
+      simplifyAndCompare('(w-x)/(-(y-z))', '(w-x)/(z-y)')
+    })
+  })
 })