3y+9y=12

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Solution for 3y+9y=12 equation: 



3y+9y=12

We move all terms to the left:

3y+9y-(12)=0

We add all the numbers together, and all the variables

12y-12=0

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

12y=12

y=12/12

y=1

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