13=21-2y

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Solution for 13=21-2y equation: 



13=21-2y

We move all terms to the left:

13-(21-2y)=0

We add all the numbers together, and all the variables

-(-2y+21)+13=0

We get rid of parentheses

2y-21+13=0

We add all the numbers together, and all the variables

2y-8=0

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

2y=8

y=8/2

y=4

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