13=7x+20

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Solution for 13=7x+20 equation: 



13=7x+20

We move all terms to the left:

13-(7x+20)=0

We get rid of parentheses

-7x-20+13=0

We add all the numbers together, and all the variables

-7x-7=0

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

-7x=7

x=7/-7

x=-1

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