8y+21=15y-18

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Solution for 8y+21=15y-18 equation: 



8y+21=15y-18

We move all terms to the left:

8y+21-(15y-18)=0

We get rid of parentheses

8y-15y+18+21=0

We add all the numbers together, and all the variables

-7y+39=0

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

-7y=-39

y=-39/-7

y=5+4/7

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