3y-15=21y

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Solution for 3y-15=21y equation: 



3y-15=21y

We move all terms to the left:

3y-15-(21y)=0

We add all the numbers together, and all the variables

-18y-15=0

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

-18y=15

y=15/-18

y=-5/6

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