150=5(1-5a)-5

Solution for 150=5(1-5a)-5 equation:

Simplifying
150 = 5(1 + -5a) + -5
150 = (1 * 5 + -5a * 5) + -5
150 = (5 + -25a) + -5

Reorder the terms:
150 = 5 + -5 + -25a

Combine like terms: 5 + -5 = 0
150 = 0 + -25a
150 = -25a

Solving
150 = -25a

Solving for variable 'a'.

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

Add '25a' to each side of the equation.
150 + 25a = -25a + 25a

Combine like terms: -25a + 25a = 0
150 + 25a = 0

Add '-150' to each side of the equation.
150 + -150 + 25a = 0 + -150

Combine like terms: 150 + -150 = 0
0 + 25a = 0 + -150
25a = 0 + -150

Combine like terms: 0 + -150 = -150
25a = -150

Divide each side by '25'.
a = -6

Simplifying
a = -6