13=3a-7

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Solution for 13=3a-7 equation: 



13=3a-7

We move all terms to the left:

13-(3a-7)=0

We get rid of parentheses

-3a+7+13=0

We add all the numbers together, and all the variables

-3a+20=0

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

-3a=-20

a=-20/-3

a=6+2/3

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