15=-8(b-1)+9b

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Solution for 15=-8(b-1)+9b equation:


Simplifying
15 = -8(b + -1) + 9b

Reorder the terms:
15 = -8(-1 + b) + 9b
15 = (-1 * -8 + b * -8) + 9b
15 = (8 + -8b) + 9b

Combine like terms: -8b + 9b = 1b
15 = 8 + 1b

Solving
15 = 8 + 1b

Solving for variable 'b'.

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

Add '-1b' to each side of the equation.
15 + -1b = 8 + 1b + -1b

Combine like terms: 1b + -1b = 0
15 + -1b = 8 + 0
15 + -1b = 8

Add '-15' to each side of the equation.
15 + -15 + -1b = 8 + -15

Combine like terms: 15 + -15 = 0
0 + -1b = 8 + -15
-1b = 8 + -15

Combine like terms: 8 + -15 = -7
-1b = -7

Divide each side by '-1'.
b = 7

Simplifying
b = 7

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