3m-18=21

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Solution for 3m-18=21 equation: 


Simplifying
3m + -18 = 21

Reorder the terms:
-18 + 3m = 21

Solving
-18 + 3m = 21

Solving for variable 'm'.

Move all terms containing m to the left, all other terms to the right.

Add '18' to each side of the equation.
-18 + 18 + 3m = 21 + 18

Combine like terms: -18 + 18 = 0
0 + 3m = 21 + 18
3m = 21 + 18

Combine like terms: 21 + 18 = 39
3m = 39

Divide each side by '3'.
m = 13

Simplifying
m = 13

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