-3(-3)+7(-3)=-12

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Solution for -3(-3)+7(-3)=-12 equation:


-3(-3)+7(-3)=-12

We simplify the equation to the form, which is simple to understand 
-3(-3)+7(-3)=-12

Reorder the terms in parentheses
+(+9)+7*(-3)=-12

Remove unnecessary parentheses
+9+7+*(-3+)=-12

Reorder the terms in parentheses
+9+(-21)=-12

Remove unnecessary parentheses
+9-21=-12

We move all terms containing  to the left and all other terms to the right. 
0=-12-9+21

We simplify left and right side of the equation. 
0=0

0=0

This equation is an identity, so all real numbers are solutions.

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