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 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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