3y+y-3=12-3

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Solution for 3y+y-3=12-3 equation: 



3y+y-3=12-3

We move all terms to the left:

3y+y-3-(12-3)=0

We add all the numbers together, and all the variables

3y+y-3-9=0

We add all the numbers together, and all the variables

4y-12=0

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

4y=12

y=12/4

y=3

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