-21=-m-6m

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Solution for -21=-m-6m equation:


Simplifying
-21 = -1m + -6m

Combine like terms: -1m + -6m = -7m
-21 = -7m

Solving
-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.
-21 + 7m = -7m + 7m

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

Add '21' to each side of the equation.
-21 + 21 + 7m = 0 + 21

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

Combine like terms: 0 + 21 = 21
7m = 21

Divide each side by '7'.
m = 3

Simplifying
m = 3

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