-13+(-21)=

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Solution for -13+(-21)= equation:


-13+(-21)=0

We simplify the equation to the form, which is simple to understand 
-13+(-21)=0

Remove unnecessary parentheses
-13-21=0

We move all terms containing  to the left and all other terms to the right. 
0=0+13+21

We simplify left and right side of the equation. 
0=+34

0=34

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

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