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

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


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

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

Remove unnecessary parentheses
-1+(-6)-(-7)-(-9)=0

Remove unnecessary parentheses
-1-6-(-7+)-(-9+)=0

Remove unnecessary parentheses
-1-6+7-(-9)=0

Remove unnecessary parentheses
-1-6+7+9=0

We move all terms containing  to the left and all other terms to the right. 
0=0+1+6-7-9

We simplify left and right side of the equation. 
0=-9

0=-9

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

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