3y+y=21

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Solution for 3y+y=21 equation: 



3y+y=21

We move all terms to the left:

3y+y-(21)=0

We add all the numbers together, and all the variables

4y-21=0

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

4y=21

y=21/4

y=5+1/4

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