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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x-7 = -(48/x+7) // + 48/x+7
x+48/x-7+7 = 0
1*x^1+48*x^-1 = 0
(1*x^2+48*x^0)/(x^1) = 0 // * x^2
x^1*(1*x^2+48*x^0) = 0
x^1
x^2+48 = 0
x^2+48 = 0
DELTA = 0^2-(1*4*48)
DELTA = -192
DELTA < 0
x in { }
x belongs to the empty set
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