-13*(-7)+21=-9*(-7)-7

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Solution for -13*(-7)+21=-9*(-7)-7 equation:


-13 * (-7) + 21= -9 * (-7) -7

We simplify the equation to the form, which is simple to understand 
-13*(-7)+21=-9*(-7)-7

Reorder the terms in parentheses
+(+91)+21=-9*(-7)-7

Remove unnecessary parentheses
+91+21=-9+*(-7+)-7

Reorder the terms in parentheses
+91+21=+(+63)-7

Remove unnecessary parentheses
+91+21=+63-7

We move all terms containing  to the left and all other terms to the right. 
0=+63-7-91-21

We simplify left and right side of the equation. 
0=-56

0=-56

The left and right sides are not equal, therefore there is no solution. This equation is invalid.

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