15=-3(x-1)+9

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


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

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

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

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

Solving
15 = 12 + -3x

Solving for variable 'x'.

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

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

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

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

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

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

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

Simplifying
x = -1

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