91=0.5H(b+b)

Solution for 91=0.5H(b+b) equation:

Simplifying
91 = 0.5H(b + b)

Combine like terms: b + b = 2b
91 = 0.5H(2b)

Remove parenthesis around (2b)
91 = 0.5H * 2b

Reorder the terms for easier multiplication:
91 = 0.5 * 2H * b

Multiply 0.5 * 2
91 = 1H * b

Multiply H * b
91 = 1bH

Solving
91 = 1bH

Solving for variable 'b'.

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

Add '-1bH' to each side of the equation.
91 + -1bH = 1bH + -1bH

Combine like terms: 1bH + -1bH = 0
91 + -1bH = 0

Add '-91' to each side of the equation.
91 + -91 + -1bH = 0 + -91

Combine like terms: 91 + -91 = 0
0 + -1bH = 0 + -91
-1bH = 0 + -91

Combine like terms: 0 + -91 = -91
-1bH = -91

Divide each side by '-1H'.
b = 91H-1

Simplifying
b = 91H-1