21=-6m+6-3

Solution for 21=-6m+6-3 equation:

Simplifying
21 = -6m + 6 + -3

Reorder the terms:
21 = 6 + -3 + -6m

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

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

Combine like terms: -6m + 6m = 0
21 + 6m = 3 + 0
21 + 6m = 3

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

Combine like terms: 21 + -21 = 0
0 + 6m = 3 + -21
6m = 3 + -21

Combine like terms: 3 + -21 = -18
6m = -18

Divide each side by '6'.
m = -3

Simplifying
m = -3