(42n+35m+7)-(50m-20n+9)= By Admin ReiPosted on October 29, 2022 (42n+35m+7)-(50m-20n+9)= (42n+35m+7)-(50m-20n+9)42n+35m+7-50m+20n-9=42n+20n+35m-50m+7-9=66n-15m-2