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17x+9=21x+12-4x
We move all terms to the left:
17x+9-(21x+12-4x)=0
We add all the numbers together, and all the variables
17x-(17x+12)+9=0
We get rid of parentheses
17x-17x-12+9=0
We add all the numbers together, and all the variables
-3!=0
There is no solution for this equation
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