13-4y=21

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Solution for 13-4y=21 equation: 



13-4y=21

We move all terms to the left:

13-4y-(21)=0

We add all the numbers together, and all the variables

-4y-8=0

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

-4y=8

y=8/-4

y=-2

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