-(y-1)+y=-1

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


Simplifying
-1(y + -1) + y = -1

Reorder the terms:
-1(-1 + y) + y = -1
(-1 * -1 + y * -1) + y = -1
(1 + -1y) + y = -1

Combine like terms: -1y + y = 0
1 + 0 = -1
1 = -1

Solving
1 = -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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