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

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

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

Combine like terms: 1 + -4 = -3
-3 + 20b = -123

Solving
-3 + 20b = -123

Solving for variable 'b'.

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

Add '3' to each side of the equation.
-3 + 3 + 20b = -123 + 3

Combine like terms: -3 + 3 = 0
0 + 20b = -123 + 3
20b = -123 + 3

Combine like terms: -123 + 3 = -120
20b = -120

Divide each side by '20'.
b = -6

Simplifying
b = -6