-3m-6(6+3m)=-141

Solution for -3m-6(6+3m)=-141 equation:

Simplifying
-3m + -6(6 + 3m) = -141
-3m + (6 * -6 + 3m * -6) = -141
-3m + (-36 + -18m) = -141

Reorder the terms:
-36 + -3m + -18m = -141

Combine like terms: -3m + -18m = -21m
-36 + -21m = -141

Solving
-36 + -21m = -141

Solving for variable 'm'.

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

Add '36' to each side of the equation.
-36 + 36 + -21m = -141 + 36

Combine like terms: -36 + 36 = 0
0 + -21m = -141 + 36
-21m = -141 + 36

Combine like terms: -141 + 36 = -105
-21m = -105

Divide each side by '-21'.
m = 5

Simplifying
m = 5