7m-21=9+m

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


Simplifying
7m + -21 = 9 + m

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

Solving
-21 + 7m = 9 + m

Solving for variable 'm'.

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

Add '-1m' to each side of the equation.
-21 + 7m + -1m = 9 + m + -1m

Combine like terms: 7m + -1m = 6m
-21 + 6m = 9 + m + -1m

Combine like terms: m + -1m = 0
-21 + 6m = 9 + 0
-21 + 6m = 9

Add '21' to each side of the equation.
-21 + 21 + 6m = 9 + 21

Combine like terms: -21 + 21 = 0
0 + 6m = 9 + 21
6m = 9 + 21

Combine like terms: 9 + 21 = 30
6m = 30

Divide each side by '6'.
m = 5

Simplifying
m = 5

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