m+6+2m=21

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Solution for m+6+2m=21 equation: 


Simplifying
m + 6 + 2m = 21

Reorder the terms:
6 + m + 2m = 21

Combine like terms: m + 2m = 3m
6 + 3m = 21

Solving
6 + 3m = 21

Solving for variable 'm'.

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

Add '-6' to each side of the equation.
6 + -6 + 3m = 21 + -6

Combine like terms: 6 + -6 = 0
0 + 3m = 21 + -6
3m = 21 + -6

Combine like terms: 21 + -6 = 15
3m = 15

Divide each side by '3'.
m = 5

Simplifying
m = 5

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