x+20=3x-160

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Solution for x+20=3x-160 equation: 



x+20=3x-160

We move all terms to the left:

x+20-(3x-160)=0

We get rid of parentheses

x-3x+160+20=0

We add all the numbers together, and all the variables

-2x+180=0

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

-2x=-180

x=-180/-2

x=+90

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