7a-7a=15

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Solution for 7a-7a=15 equation: 


Simplifying
7a + -7a = 15

Combine like terms: 7a + -7a = 0
0 = 15

Solving
0 = 15

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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