21+m=4m

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Solution for 21+m=4m equation:


Simplifying
21 + m = 4m

Solving
21 + m = 4m

Solving for variable 'm'.

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

Add '-4m' to each side of the equation.
21 + m + -4m = 4m + -4m

Combine like terms: m + -4m = -3m
21 + -3m = 4m + -4m

Combine like terms: 4m + -4m = 0
21 + -3m = 0

Add '-21' to each side of the equation.
21 + -21 + -3m = 0 + -21

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

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

Divide each side by '-3'.
m = 7

Simplifying
m = 7

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