15=(12-x)+(9x)

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Solution for 15=(12-x)+(9x) equation:


Simplifying
15 = (12 + -1x) + (9x)

Remove parenthesis around (12 + -1x)
15 = 12 + -1x + (9x)

Combine like terms: -1x + (9x) = 8x
15 = 12 + 8x

Solving
15 = 12 + 8x

Solving for variable 'x'.

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

Add '-8x' to each side of the equation.
15 + -8x = 12 + 8x + -8x

Combine like terms: 8x + -8x = 0
15 + -8x = 12 + 0
15 + -8x = 12

Add '-15' to each side of the equation.
15 + -15 + -8x = 12 + -15

Combine like terms: 15 + -15 = 0
0 + -8x = 12 + -15
-8x = 12 + -15

Combine like terms: 12 + -15 = -3
-8x = -3

Divide each side by '-8'.
x = 0.375

Simplifying
x = 0.375

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