-15++9=-6

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Solution for -15++9=-6 equation:


-15++9=-6

We simplify the equation to the form, which is simple to understand 
-15+9=-6

We move all terms containing  to the left and all other terms to the right. 
0=-6+15-9

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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