y+3y=9

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Solution for y+3y=9 equation: 



y+3y=9

We move all terms to the left:

y+3y-(9)=0

We add all the numbers together, and all the variables

4y-9=0

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

4y=9

y=9/4

y=2+1/4

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