15=-3(b-1)+9

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Solution for 15=-3(b-1)+9 equation:


Simplifying
15 = -3(b + -1) + 9

Reorder the terms:
15 = -3(-1 + b) + 9
15 = (-1 * -3 + b * -3) + 9
15 = (3 + -3b) + 9

Reorder the terms:
15 = 3 + 9 + -3b

Combine like terms: 3 + 9 = 12
15 = 12 + -3b

Solving
15 = 12 + -3b

Solving for variable 'b'.

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

Add '3b' to each side of the equation.
15 + 3b = 12 + -3b + 3b

Combine like terms: -3b + 3b = 0
15 + 3b = 12 + 0
15 + 3b = 12

Add '-15' to each side of the equation.
15 + -15 + 3b = 12 + -15

Combine like terms: 15 + -15 = 0
0 + 3b = 12 + -15
3b = 12 + -15

Combine like terms: 12 + -15 = -3
3b = -3

Divide each side by '3'.
b = -1

Simplifying
b = -1

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