3y-21=15

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Solution for 3y-21=15 equation: 



3y-21=15

We move all terms to the left:

3y-21-(15)=0

We add all the numbers together, and all the variables

3y-36=0

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

3y=36

y=36/3

y=12

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