3m-1=7m-21

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Solution for 3m-1=7m-21 equation:


Simplifying
3m + -1 = 7m + -21

Reorder the terms:
-1 + 3m = 7m + -21

Reorder the terms:
-1 + 3m = -21 + 7m

Solving
-1 + 3m = -21 + 7m

Solving for variable 'm'.

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

Add '-7m' to each side of the equation.
-1 + 3m + -7m = -21 + 7m + -7m

Combine like terms: 3m + -7m = -4m
-1 + -4m = -21 + 7m + -7m

Combine like terms: 7m + -7m = 0
-1 + -4m = -21 + 0
-1 + -4m = -21

Add '1' to each side of the equation.
-1 + 1 + -4m = -21 + 1

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

Combine like terms: -21 + 1 = -20
-4m = -20

Divide each side by '-4'.
m = 5

Simplifying
m = 5

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