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5x+4x-3x-12x=9
We move all terms to the left:
5x+4x-3x-12x-(9)=0
We add all the numbers together, and all the variables
-6x-9=0
We move all terms containing x to the left, all other terms to the right
-6x=9
x=9/-6
x=-1+1/2
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