123=-3(1+6b)

Solution for 123=-3(1+6b) equation:

Simplifying
123 = -3(1 + 6b)
123 = (1 * -3 + 6b * -3)
123 = (-3 + -18b)

Solving
123 = -3 + -18b

Solving for variable 'b'.

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

Add '18b' to each side of the equation.
123 + 18b = -3 + -18b + 18b

Combine like terms: -18b + 18b = 0
123 + 18b = -3 + 0
123 + 18b = -3

Add '-123' to each side of the equation.
123 + -123 + 18b = -3 + -123

Combine like terms: 123 + -123 = 0
0 + 18b = -3 + -123
18b = -3 + -123

Combine like terms: -3 + -123 = -126
18b = -126

Divide each side by '18'.
b = -7

Simplifying
b = -7