x-15+8x-3=90

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Solution for x-15+8x-3=90 equation:


Simplifying
x + -15 + 8x + -3 = 90

Reorder the terms:
-15 + -3 + x + 8x = 90

Combine like terms: -15 + -3 = -18
-18 + x + 8x = 90

Combine like terms: x + 8x = 9x
-18 + 9x = 90

Solving
-18 + 9x = 90

Solving for variable 'x'.

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

Add '18' to each side of the equation.
-18 + 18 + 9x = 90 + 18

Combine like terms: -18 + 18 = 0
0 + 9x = 90 + 18
9x = 90 + 18

Combine like terms: 90 + 18 = 108
9x = 108

Divide each side by '9'.
x = 12

Simplifying
x = 12

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