7y-3=15y+21

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Solution for 7y-3=15y+21 equation: 



7y-3=15y+21

We move all terms to the left:

7y-3-(15y+21)=0

We get rid of parentheses

7y-15y-21-3=0

We add all the numbers together, and all the variables

-8y-24=0

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

-8y=24

y=24/-8

y=-3

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