123=3(-7k-8)

Solution for 123=3(-7k-8) equation:

Simplifying
123 = 3(-7k + -8)

Reorder the terms:
123 = 3(-8 + -7k)
123 = (-8 * 3 + -7k * 3)
123 = (-24 + -21k)

Solving
123 = -24 + -21k

Solving for variable 'k'.

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

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

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

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

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

Combine like terms: -24 + -123 = -147
21k = -147

Divide each side by '21'.
k = -7

Simplifying
k = -7