13-7x=-21

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Solution for 13-7x=-21 equation: 



13-7x=-21

We move all terms to the left:

13-7x-(-21)=0

We add all the numbers together, and all the variables

-7x+34=0

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

-7x=-34

x=-34/-7

x=4+6/7

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