-9--9+-4=

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Solution for -9--9+-4= equation:


-9--9+-4=0

We simplify the equation to the form, which is simple to understand 
-9+9+-4=0

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

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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