13=20-y

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Solution for 13=20-y equation: 



13=20-y

We move all terms to the left:

13-(20-y)=0

We add all the numbers together, and all the variables

-(-1y+20)+13=0

We get rid of parentheses

1y-20+13=0

We add all the numbers together, and all the variables

y-7=0

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

y=7

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