351=x+2x

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Solution for 351=x+2x equation: 



351=x+2x

We move all terms to the left:

351-(x+2x)=0

We add all the numbers together, and all the variables

-(+3x)+351=0

We get rid of parentheses

-3x+351=0

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

-3x=-351

x=-351/-3

x=+117

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