3m+21=4m-8

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


Simplifying
3m + 21 = 4m + -8

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

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

Solving
21 + 3m = -8 + 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 + 3m + -4m = -8 + 4m + -4m

Combine like terms: 3m + -4m = -1m
21 + -1m = -8 + 4m + -4m

Combine like terms: 4m + -4m = 0
21 + -1m = -8 + 0
21 + -1m = -8

Add '-21' to each side of the equation.
21 + -21 + -1m = -8 + -21

Combine like terms: 21 + -21 = 0
0 + -1m = -8 + -21
-1m = -8 + -21

Combine like terms: -8 + -21 = -29
-1m = -29

Divide each side by '-1'.
m = 29

Simplifying
m = 29

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