13=y+21

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Solution for 13=y+21 equation: 



13=y+21

We move all terms to the left:

13-(y+21)=0

We get rid of parentheses

-y-21+13=0

We add all the numbers together, and all the variables

-1y-8=0

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

-y=8

y=8/-1

y=-8

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