13=a+20

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Solution for 13=a+20 equation: 



13=a+20

We move all terms to the left:

13-(a+20)=0

We get rid of parentheses

-a-20+13=0

We add all the numbers together, and all the variables

-1a-7=0

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

-a=7

a=7/-1

a=-7

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