1y+2-1y=7

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Solution for 1y+2-1y=7 equation: 


Simplifying
1y + 2 + -1y = 7

Reorder the terms:
2 + 1y + -1y = 7

Combine like terms: 1y + -1y = 0
2 + 0 = 7
2 = 7

Solving
2 = 7

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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