.3(m+21)+.6=-2

Solution for .3(m+21)+.6=-2 equation:

Simplifying
0.3(m + 21) + 0.6 = -2

Reorder the terms:
0.3(21 + m) + 0.6 = -2
(21 * 0.3 + m * 0.3) + 0.6 = -2
(6.3 + 0.3m) + 0.6 = -2

Reorder the terms:
6.3 + 0.6 + 0.3m = -2

Combine like terms: 6.3 + 0.6 = 6.9
6.9 + 0.3m = -2

Solving
6.9 + 0.3m = -2

Solving for variable 'm'.

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

Add '-6.9' to each side of the equation.
6.9 + -6.9 + 0.3m = -2 + -6.9

Combine like terms: 6.9 + -6.9 = 0.0
0.0 + 0.3m = -2 + -6.9
0.3m = -2 + -6.9

Combine like terms: -2 + -6.9 = -8.9
0.3m = -8.9

Divide each side by '0.3'.
m = -29.66666667

Simplifying
m = -29.66666667