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