123=6-3(5m+5)

Solution for 123=6-3(5m+5) equation:

Simplifying
123 = 6 + -3(5m + 5)

Reorder the terms:
123 = 6 + -3(5 + 5m)
123 = 6 + (5 * -3 + 5m * -3)
123 = 6 + (-15 + -15m)

Combine like terms: 6 + -15 = -9
123 = -9 + -15m

Solving
123 = -9 + -15m

Solving for variable 'm'.

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

Add '15m' to each side of the equation.
123 + 15m = -9 + -15m + 15m

Combine like terms: -15m + 15m = 0
123 + 15m = -9 + 0
123 + 15m = -9

Add '-123' to each side of the equation.
123 + -123 + 15m = -9 + -123

Combine like terms: 123 + -123 = 0
0 + 15m = -9 + -123
15m = -9 + -123

Combine like terms: -9 + -123 = -132
15m = -132

Divide each side by '15'.
m = -8.8

Simplifying
m = -8.8