8+13=21y

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Solution for 8+13=21y equation: 



8+13=21y

We move all terms to the left:

8+13-(21y)=0

We add all the numbers together, and all the variables

-21y+21=0

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

-21y=-21

y=-21/-21

y=1

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