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3y+6-6y+12=9y+18-12y
We move all terms to the left:
3y+6-6y+12-(9y+18-12y)=0
We add all the numbers together, and all the variables
3y-6y-(-3y+18)+6+12=0
We add all the numbers together, and all the variables
-3y-(-3y+18)+18=0
We get rid of parentheses
-3y+3y-18+18=0
We add all the numbers together, and all the variables
=0
y=0/1
y=0
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