-90=-5(-6b)

Solution for -90=-5(-6b) equation:

Simplifying
-90 = -5(-6b)

Remove parenthesis around (-6b)
-90 = -5 * -6b

Multiply -5 * -6
-90 = 30b

Solving
-90 = 30b

Solving for variable 'b'.

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

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

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

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

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

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

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

Simplifying
b = -3