x+9=3x-18=2x-21

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Solution for x+9=3x-18=2x-21 equation: 



x+9=3x-18=2x-21

We move all terms to the left:

x+9-(3x-18)=0

We get rid of parentheses

x-3x+18+9=0

We add all the numbers together, and all the variables

-2x+27=0

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

-2x=-27

x=-27/-2

x=13+1/2

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