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9x+18=12x-3x+15
We move all terms to the left:
9x+18-(12x-3x+15)=0
We add all the numbers together, and all the variables
9x-(9x+15)+18=0
We get rid of parentheses
9x-9x-15+18=0
We add all the numbers together, and all the variables
3!=0
There is no solution for this equation
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