x+x+3x=255

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Solution for x+x+3x=255 equation: 



x+x+3x=255

We move all terms to the left:

x+x+3x-(255)=0

We add all the numbers together, and all the variables

5x-255=0

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

5x=255

x=255/5

x=51

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