80=x+3x

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Solution for 80=x+3x equation: 



80=x+3x

We move all terms to the left:

80-(x+3x)=0

We add all the numbers together, and all the variables

-(+4x)+80=0

We get rid of parentheses

-4x+80=0

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

-4x=-80

x=-80/-4

x=+20

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