3m+21=8m-4

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Solution for 3m+21=8m-4 equation:


Simplifying
3m + 21 = 8m + -4

Reorder the terms:
21 + 3m = 8m + -4

Reorder the terms:
21 + 3m = -4 + 8m

Solving
21 + 3m = -4 + 8m

Solving for variable 'm'.

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

Add '-8m' to each side of the equation.
21 + 3m + -8m = -4 + 8m + -8m

Combine like terms: 3m + -8m = -5m
21 + -5m = -4 + 8m + -8m

Combine like terms: 8m + -8m = 0
21 + -5m = -4 + 0
21 + -5m = -4

Add '-21' to each side of the equation.
21 + -21 + -5m = -4 + -21

Combine like terms: 21 + -21 = 0
0 + -5m = -4 + -21
-5m = -4 + -21

Combine like terms: -4 + -21 = -25
-5m = -25

Divide each side by '-5'.
m = 5

Simplifying
m = 5

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