-7+7=(-1)

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


Simplifying
-7 + 7 = (-1)

Combine like terms: -7 + 7 = 0
0 = (-1)
0 = -1

Solving
0 = -1

Couldn't find a variable to solve for.

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

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