90=5-5(1+6n)

Solution for 90=5-5(1+6n) equation:

Simplifying
90 = 5 + -5(1 + 6n)
90 = 5 + (1 * -5 + 6n * -5)
90 = 5 + (-5 + -30n)

Combine like terms: 5 + -5 = 0
90 = 0 + -30n
90 = -30n

Solving
90 = -30n

Solving for variable 'n'.

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

Add '30n' to each side of the equation.
90 + 30n = -30n + 30n

Combine like terms: -30n + 30n = 0
90 + 30n = 0

Add '-90' to each side of the equation.
90 + -90 + 30n = 0 + -90

Combine like terms: 90 + -90 = 0
0 + 30n = 0 + -90
30n = 0 + -90

Combine like terms: 0 + -90 = -90
30n = -90

Divide each side by '30'.
n = -3

Simplifying
n = -3