7+5+15=30

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Solution for 7+5+15=30 equation: 


Simplifying
7 + 5 + 15 = 30

Combine like terms: 7 + 5 = 12
12 + 15 = 30

Combine like terms: 12 + 15 = 27
27 = 30

Solving
27 = 30

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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