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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