3y-21=5y-15

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Solution for 3y-21=5y-15 equation: 



3y-21=5y-15

We move all terms to the left:

3y-21-(5y-15)=0

We get rid of parentheses

3y-5y+15-21=0

We add all the numbers together, and all the variables

-2y-6=0

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

-2y=6

y=6/-2

y=-3

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