7m+21=9m+7

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Solution for 7m+21=9m+7 equation:


Simplifying
7m + 21 = 9m + 7

Reorder the terms:
21 + 7m = 9m + 7

Reorder the terms:
21 + 7m = 7 + 9m

Solving
21 + 7m = 7 + 9m

Solving for variable 'm'.

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

Add '-9m' to each side of the equation.
21 + 7m + -9m = 7 + 9m + -9m

Combine like terms: 7m + -9m = -2m
21 + -2m = 7 + 9m + -9m

Combine like terms: 9m + -9m = 0
21 + -2m = 7 + 0
21 + -2m = 7

Add '-21' to each side of the equation.
21 + -21 + -2m = 7 + -21

Combine like terms: 21 + -21 = 0
0 + -2m = 7 + -21
-2m = 7 + -21

Combine like terms: 7 + -21 = -14
-2m = -14

Divide each side by '-2'.
m = 7

Simplifying
m = 7

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