13y-21y=15

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Solution for 13y-21y=15 equation: 



13y-21y=15

We move all terms to the left:

13y-21y-(15)=0

We add all the numbers together, and all the variables

-8y-15=0

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

-8y=15

y=15/-8

y=-1+7/8

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