2x. This is because x is also the same as 1x so the equation really is 3x-1x.
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3x * (x - 4) = 3x*x - 3x*4 = 3x^2 - 12x.
(3x2 - 6x)/3x = 3x(x-2)/3x = x-2, for x<>0
x^2 + 3x + 2/(-3x) - x^2 - 2=3x-2+2/(-3x)=3x-2-2/(3x)
3x - 5x + x = -x
3x - x = (3 - 1)x = 2x