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15y-9-3y=12y+13
We move all terms to the left:
15y-9-3y-(12y+13)=0
We add all the numbers together, and all the variables
12y-(12y+13)-9=0
We get rid of parentheses
12y-12y-13-9=0
We add all the numbers together, and all the variables
-22!=0
There is no solution for this equation
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