9-x-2x=-15

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Solution for 9-x-2x=-15 equation: 


Simplifying
9 + -1x + -2x = -15

Combine like terms: -1x + -2x = -3x
9 + -3x = -15

Solving
9 + -3x = -15

Solving for variable 'x'.

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

Add '-9' to each side of the equation.
9 + -9 + -3x = -15 + -9

Combine like terms: 9 + -9 = 0
0 + -3x = -15 + -9
-3x = -15 + -9

Combine like terms: -15 + -9 = -24
-3x = -24

Divide each side by '-3'.
x = 8

Simplifying
x = 8

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