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18(x+1)=21x+9-3x
We move all terms to the left:
18(x+1)-(21x+9-3x)=0
We add all the numbers together, and all the variables
18(x+1)-(18x+9)=0
We multiply parentheses
18x-(18x+9)+18=0
We get rid of parentheses
18x-18x-9+18=0
We add all the numbers together, and all the variables
9!=0
There is no solution for this equation
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