-21-3m=-3(-2m-5)

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Solution for -21-3m=-3(-2m-5) equation:


Simplifying
-21 + -3m = -3(-2m + -5)

Reorder the terms:
-21 + -3m = -3(-5 + -2m)
-21 + -3m = (-5 * -3 + -2m * -3)
-21 + -3m = (15 + 6m)

Solving
-21 + -3m = 15 + 6m

Solving for variable 'm'.

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

Add '-6m' to each side of the equation.
-21 + -3m + -6m = 15 + 6m + -6m

Combine like terms: -3m + -6m = -9m
-21 + -9m = 15 + 6m + -6m

Combine like terms: 6m + -6m = 0
-21 + -9m = 15 + 0
-21 + -9m = 15

Add '21' to each side of the equation.
-21 + 21 + -9m = 15 + 21

Combine like terms: -21 + 21 = 0
0 + -9m = 15 + 21
-9m = 15 + 21

Combine like terms: 15 + 21 = 36
-9m = 36

Divide each side by '-9'.
m = -4

Simplifying
m = -4

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