3m-3+9=21

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Solution for 3m-3+9=21 equation: 


Simplifying
3m + -3 + 9 = 21

Reorder the terms:
-3 + 9 + 3m = 21

Combine like terms: -3 + 9 = 6
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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