18m-15=21m-3m

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Solution for 18m-15=21m-3m equation: 


Simplifying
18m + -15 = 21m + -3m

Reorder the terms:
-15 + 18m = 21m + -3m

Combine like terms: 21m + -3m = 18m
-15 + 18m = 18m

Add '-18m' to each side of the equation.
-15 + 18m + -18m = 18m + -18m

Combine like terms: 18m + -18m = 0
-15 + 0 = 18m + -18m
-15 = 18m + -18m

Combine like terms: 18m + -18m = 0
-15 = 0

Solving
-15 = 0

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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