2m+21=3m+9

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Solution for 2m+21=3m+9 equation:


Simplifying
2m + 21 = 3m + 9

Reorder the terms:
21 + 2m = 3m + 9

Reorder the terms:
21 + 2m = 9 + 3m

Solving
21 + 2m = 9 + 3m

Solving for variable 'm'.

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

Add '-3m' to each side of the equation.
21 + 2m + -3m = 9 + 3m + -3m

Combine like terms: 2m + -3m = -1m
21 + -1m = 9 + 3m + -3m

Combine like terms: 3m + -3m = 0
21 + -1m = 9 + 0
21 + -1m = 9

Add '-21' to each side of the equation.
21 + -21 + -1m = 9 + -21

Combine like terms: 21 + -21 = 0
0 + -1m = 9 + -21
-1m = 9 + -21

Combine like terms: 9 + -21 = -12
-1m = -12

Divide each side by '-1'.
m = 12

Simplifying
m = 12

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