90=[(b*3)-5]+b

Solution for 90=[(b*3)-5]+b equation:

Simplifying
90 = [(b * 3) + -5] + b

Reorder the terms for easier multiplication:
90 = [(3b) + -5] + b

Reorder the terms:
90 = [-5 + (3b)] + b

Remove brackets around [-5 + (3b)]
90 = -5 + (3b) + b

Combine like terms: (3b) + b = 4b
90 = -5 + 4b

Solving
90 = -5 + 4b

Solving for variable 'b'.

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

Add '-4b' to each side of the equation.
90 + -4b = -5 + 4b + -4b

Combine like terms: 4b + -4b = 0
90 + -4b = -5 + 0
90 + -4b = -5

Add '-90' to each side of the equation.
90 + -90 + -4b = -5 + -90

Combine like terms: 90 + -90 = 0
0 + -4b = -5 + -90
-4b = -5 + -90

Combine like terms: -5 + -90 = -95
-4b = -95

Divide each side by '-4'.
b = 23.75

Simplifying
b = 23.75