15=4(x-3)-(x-9)

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Solution for 15=4(x-3)-(x-9) equation: 


Simplifying
15 = 4(x + -3) + -1(x + -9)

Reorder the terms:
15 = 4(-3 + x) + -1(x + -9)
15 = (-3 * 4 + x * 4) + -1(x + -9)
15 = (-12 + 4x) + -1(x + -9)

Reorder the terms:
15 = -12 + 4x + -1(-9 + x)
15 = -12 + 4x + (-9 * -1 + x * -1)
15 = -12 + 4x + (9 + -1x)

Reorder the terms:
15 = -12 + 9 + 4x + -1x

Combine like terms: -12 + 9 = -3
15 = -3 + 4x + -1x

Combine like terms: 4x + -1x = 3x
15 = -3 + 3x

Solving
15 = -3 + 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 = -3 + 3x + -3x

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

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

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

Combine like terms: -3 + -15 = -18
-3x = -18

Divide each side by '-3'.
x = 6

Simplifying
x = 6

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