4m-9=8m-21

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Solution for 4m-9=8m-21 equation:


Simplifying
4m + -9 = 8m + -21

Reorder the terms:
-9 + 4m = 8m + -21

Reorder the terms:
-9 + 4m = -21 + 8m

Solving
-9 + 4m = -21 + 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.
-9 + 4m + -8m = -21 + 8m + -8m

Combine like terms: 4m + -8m = -4m
-9 + -4m = -21 + 8m + -8m

Combine like terms: 8m + -8m = 0
-9 + -4m = -21 + 0
-9 + -4m = -21

Add '9' to each side of the equation.
-9 + 9 + -4m = -21 + 9

Combine like terms: -9 + 9 = 0
0 + -4m = -21 + 9
-4m = -21 + 9

Combine like terms: -21 + 9 = -12
-4m = -12

Divide each side by '-4'.
m = 3

Simplifying
m = 3

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