15=-3(y-1)+9

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


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

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

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

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

Solving
15 = 12 + -3y

Solving for variable 'y'.

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

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

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

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

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

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

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

Simplifying
y = -1

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