80-x=3x+20

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Solution for 80-x=3x+20 equation: 



80-x=3x+20

We move all terms to the left:

80-x-(3x+20)=0

We add all the numbers together, and all the variables

-1x-(3x+20)+80=0

We get rid of parentheses

-1x-3x-20+80=0

We add all the numbers together, and all the variables

-4x+60=0

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

-4x=-60

x=-60/-4

x=+15

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