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12x+9=8x+4x+1
We move all terms to the left:
12x+9-(8x+4x+1)=0
We add all the numbers together, and all the variables
12x-(12x+1)+9=0
We get rid of parentheses
12x-12x-1+9=0
We add all the numbers together, and all the variables
8!=0
There is no solution for this equation
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