15-6y=21

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Solution for 15-6y=21 equation: 



15-6y=21

We move all terms to the left:

15-6y-(21)=0

We add all the numbers together, and all the variables

-6y-6=0

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

-6y=6

y=6/-6

y=-1

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