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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
8*x-(7*x)-((3/2)*x)-(12/x) = 0
8*x-7*x+(-3/2)*x-12*x^-1 = 0
-1/2*x^1-12*x^-1 = 0
(-1/2*x^2-12*x^0)/(x^1) = 0 // * x^2
x^1*(-1/2*x^2-12*x^0) = 0
x^1
(-1/2)*x^2-12 = 0
(-1/2)*x^2-12 = 0
DELTA = 0^2-(-12*4*(-1/2))
DELTA = -24
DELTA < 0
x in { }
x belongs to the empty set
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