y+2y=9+3

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Solution for y+2y=9+3 equation: 



y+2y=9+3

We move all terms to the left:

y+2y-(9+3)=0

We add all the numbers together, and all the variables

y+2y-12=0

We add all the numbers together, and all the variables

3y-12=0

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

3y=12

y=12/3

y=4

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