13-1(-6+7)+9=

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Solution for 13-1(-6+7)+9= equation:


13-1 (-6+7)+9=0

We simplify the equation to the form, which is simple to understand 
13-1(-6+7)+9=0

Simplifying terms in parentheses
13-1*(+1)+9=0

Reorder the terms in parentheses
13+(-1)+9=0

Remove unnecessary parentheses
+13-1+9=0

We move all terms containing  to the left and all other terms to the right. 
0=0-13+1-9

We simplify left and right side of the equation. 
0=-21

0=-21

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

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