4y-21=15+8y

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Solution for 4y-21=15+8y equation: 



4y-21=15+8y

We move all terms to the left:

4y-21-(15+8y)=0

We add all the numbers together, and all the variables

4y-(8y+15)-21=0

We get rid of parentheses

4y-8y-15-21=0

We add all the numbers together, and all the variables

-4y-36=0

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

-4y=36

y=36/-4

y=-9

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