-3m-21=0

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Solution for -3m-21=0 equation: 


Simplifying
-3m + -21 = 0

Reorder the terms:
-21 + -3m = 0

Solving
-21 + -3m = 0

Solving for variable 'm'.

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

Add '21' to each side of the equation.
-21 + 21 + -3m = 0 + 21

Combine like terms: -21 + 21 = 0
0 + -3m = 0 + 21
-3m = 0 + 21

Combine like terms: 0 + 21 = 21
-3m = 21

Divide each side by '-3'.
m = -7

Simplifying
m = -7

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