1x+2x=-9

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Solution for 1x+2x=-9 equation: 


Simplifying
1x + 2x = -9

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

Solving
3x = -9

Solving for variable 'x'.

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

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

Simplifying
x = -3

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