-x-2x=-9

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



-x-2x=-9

We move all terms to the left:

-x-2x-(-9)=0

We add all the numbers together, and all the variables

-3x+9=0

We move all terms containing x to the left, all other terms to the right

-3x=-9

x=-9/-3

x=+3

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