1-3m-m=21

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


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

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

Solving
1 + -4m = 21

Solving for variable 'm'.

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

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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