255-x-x=39

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Solution for 255-x-x=39 equation: 



255-x-x=39

We move all terms to the left:

255-x-x-(39)=0

We add all the numbers together, and all the variables

-2x+216=0

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

-2x=-216

x=-216/-2

x=+108

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