90-4y+4y=180

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Solution for 90-4y+4y=180 equation: 


Simplifying
90 + -4y + 4y = 180

Combine like terms: -4y + 4y = 0
90 + 0 = 180
90 = 180

Solving
90 = 180

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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