21=-7m+m

Solution for 21=-7m+m equation:

Simplifying
21 = -7m + m

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

Solving
21 = -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 = -6m + 6m

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

Add '-21' to each side of the equation.
21 + -21 + 6m = 0 + -21

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

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

Divide each side by '6'.
m = -3.5

Simplifying
m = -3.5