y+2y=21

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Solution for y+2y=21 equation: 



y+2y=21

We move all terms to the left:

y+2y-(21)=0

We add all the numbers together, and all the variables

3y-21=0

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

3y=21

y=21/3

y=7

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