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5x-12-2x=9+4x
We move all terms to the left:
5x-12-2x-(9+4x)=0
We add all the numbers together, and all the variables
5x-2x-(4x+9)-12=0
We add all the numbers together, and all the variables
3x-(4x+9)-12=0
We get rid of parentheses
3x-4x-9-12=0
We add all the numbers together, and all the variables
-1x-21=0
We move all terms containing x to the left, all other terms to the right
-x=21
x=21/-1
x=-21
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