15-x+8x=-13

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Solution for 15-x+8x=-13 equation: 


Simplifying
15 + -1x + 8x = -13

Combine like terms: -1x + 8x = 7x
15 + 7x = -13

Solving
15 + 7x = -13

Solving for variable 'x'.

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

Add '-15' to each side of the equation.
15 + -15 + 7x = -13 + -15

Combine like terms: 15 + -15 = 0
0 + 7x = -13 + -15
7x = -13 + -15

Combine like terms: -13 + -15 = -28
7x = -28

Divide each side by '7'.
x = -4

Simplifying
x = -4

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