3y+12-y=54

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Solution for 3y+12-y=54 equation: 



3y+12-y=54

We move all terms to the left:

3y+12-y-(54)=0

We add all the numbers together, and all the variables

2y-42=0

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

2y=42

y=42/2

y=21

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