-(-9)=-21

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Solution for -(-9)=-21 equation:


-(-9)=-21

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

Remove unnecessary parentheses
+9=-21

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

We simplify left and right side of the equation. 
0=-30

0=-30

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

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