(90-x)*5-x*2=387

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Solution for (90-x)*5-x*2=387 equation:


Simplifying
(90 + -1x) * 5 + -1x * 2 = 387

Reorder the terms for easier multiplication:
5(90 + -1x) + -1x * 2 = 387
(90 * 5 + -1x * 5) + -1x * 2 = 387
(450 + -5x) + -1x * 2 = 387

Reorder the terms for easier multiplication:
450 + -5x + -1 * 2x = 387

Multiply -1 * 2
450 + -5x + -2x = 387

Combine like terms: -5x + -2x = -7x
450 + -7x = 387

Solving
450 + -7x = 387

Solving for variable 'x'.

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

Add '-450' to each side of the equation.
450 + -450 + -7x = 387 + -450

Combine like terms: 450 + -450 = 0
0 + -7x = 387 + -450
-7x = 387 + -450

Combine like terms: 387 + -450 = -63
-7x = -63

Divide each side by '-7'.
x = 9

Simplifying
x = 9

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