7-y=5-y

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Solution for 7-y=5-y equation: 


Simplifying
7 + -1y = 5 + -1y

Add 'y' to each side of the equation.
7 + -1y + y = 5 + -1y + y

Combine like terms: -1y + y = 0
7 + 0 = 5 + -1y + y
7 = 5 + -1y + y

Combine like terms: -1y + y = 0
7 = 5 + 0
7 = 5

Solving
7 = 5

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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