123=-3-3(6-8k)

Solution for 123=-3-3(6-8k) equation:

Simplifying
123 = -3 + -3(6 + -8k)
123 = -3 + (6 * -3 + -8k * -3)
123 = -3 + (-18 + 24k)

Combine like terms: -3 + -18 = -21
123 = -21 + 24k

Solving
123 = -21 + 24k

Solving for variable 'k'.

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

Add '-24k' to each side of the equation.
123 + -24k = -21 + 24k + -24k

Combine like terms: 24k + -24k = 0
123 + -24k = -21 + 0
123 + -24k = -21

Add '-123' to each side of the equation.
123 + -123 + -24k = -21 + -123

Combine like terms: 123 + -123 = 0
0 + -24k = -21 + -123
-24k = -21 + -123

Combine like terms: -21 + -123 = -144
-24k = -144

Divide each side by '-24'.
k = 6

Simplifying
k = 6