(13x-21)=31

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Solution for (13x-21)=31 equation: 



(13x-21)=31

We move all terms to the left:

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

We get rid of parentheses

13x-21-31=0

We add all the numbers together, and all the variables

13x-52=0

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

13x=52

x=52/13

x=4

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