(-7y)-(-7y)=

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Solution for (-7y)-(-7y)= equation: 


Simplifying
(-7y) + -1(-7y) = 0

Remove parenthesis around (-7y)
(-7y) + -1 * -7y = 0

Multiply -1 * -7
(-7y) + 7y = 0

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

Solving
0 = 0

Couldn't find a variable to solve for.

This equation is an identity, all real numbers are solutions.

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