-4(1-5b)-3b=-123

Solution for -4(1-5b)-3b=-123 equation:

Simplifying
-4(1 + -5b) + -3b = -123
(1 * -4 + -5b * -4) + -3b = -123
(-4 + 20b) + -3b = -123

Combine like terms: 20b + -3b = 17b
-4 + 17b = -123

Solving
-4 + 17b = -123

Solving for variable 'b'.

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

Add '4' to each side of the equation.
-4 + 4 + 17b = -123 + 4

Combine like terms: -4 + 4 = 0
0 + 17b = -123 + 4
17b = -123 + 4

Combine like terms: -123 + 4 = -119
17b = -119

Divide each side by '17'.
b = -7

Simplifying
b = -7