3-12+9y=18

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Solution for 3-12+9y=18 equation: 



3-12+9y=18

We move all terms to the left:

3-12+9y-(18)=0

We add all the numbers together, and all the variables

9y-27=0

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

9y=27

y=27/9

y=3

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