-(6+6m)-7(m+3)=64

Solution for -(6+6m)-7(m+3)=64 equation:

Simplifying
-1(6 + 6m) + -7(m + 3) = 64
(6 * -1 + 6m * -1) + -7(m + 3) = 64
(-6 + -6m) + -7(m + 3) = 64

Reorder the terms:
-6 + -6m + -7(3 + m) = 64
-6 + -6m + (3 * -7 + m * -7) = 64
-6 + -6m + (-21 + -7m) = 64

Reorder the terms:
-6 + -21 + -6m + -7m = 64

Combine like terms: -6 + -21 = -27
-27 + -6m + -7m = 64

Combine like terms: -6m + -7m = -13m
-27 + -13m = 64

Solving
-27 + -13m = 64

Solving for variable 'm'.

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

Add '27' to each side of the equation.
-27 + 27 + -13m = 64 + 27

Combine like terms: -27 + 27 = 0
0 + -13m = 64 + 27
-13m = 64 + 27

Combine like terms: 64 + 27 = 91
-13m = 91

Divide each side by '-13'.
m = -7

Simplifying
m = -7