13x-21=85x+31

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Solution for 13x-21=85x+31 equation: 



13x-21=85x+31

We move all terms to the left:

13x-21-(85x+31)=0

We get rid of parentheses

13x-85x-31-21=0

We add all the numbers together, and all the variables

-72x-52=0

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

-72x=52

x=52/-72

x=-13/18

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