9=(90-x)*.15

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Solution for 9=(90-x)*.15 equation:


Simplifying
9 = (90 + -1x) * 0.15

Reorder the terms for easier multiplication:
9 = 0.15(90 + -1x)
9 = (90 * 0.15 + -1x * 0.15)
9 = (13.5 + -0.15x)

Solving
9 = 13.5 + -0.15x

Solving for variable 'x'.

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

Add '0.15x' to each side of the equation.
9 + 0.15x = 13.5 + -0.15x + 0.15x

Combine like terms: -0.15x + 0.15x = 0.00
9 + 0.15x = 13.5 + 0.00
9 + 0.15x = 13.5

Add '-9' to each side of the equation.
9 + -9 + 0.15x = 13.5 + -9

Combine like terms: 9 + -9 = 0
0 + 0.15x = 13.5 + -9
0.15x = 13.5 + -9

Combine like terms: 13.5 + -9 = 4.5
0.15x = 4.5

Divide each side by '0.15'.
x = 30

Simplifying
x = 30

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