91=-7(b-6)

Solution for 91=-7(b-6) equation:

Simplifying
91 = -7(b + -6)

Reorder the terms:
91 = -7(-6 + b)
91 = (-6 * -7 + b * -7)
91 = (42 + -7b)

Solving
91 = 42 + -7b

Solving for variable 'b'.

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

Add '7b' to each side of the equation.
91 + 7b = 42 + -7b + 7b

Combine like terms: -7b + 7b = 0
91 + 7b = 42 + 0
91 + 7b = 42

Add '-91' to each side of the equation.
91 + -91 + 7b = 42 + -91

Combine like terms: 91 + -91 = 0
0 + 7b = 42 + -91
7b = 42 + -91

Combine like terms: 42 + -91 = -49
7b = -49

Divide each side by '7'.
b = -7

Simplifying
b = -7