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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
y = -48/x // + -48/x
y-(-48/x) = 0
48*x^-1+y = 0
48*x^-1 = -y // : 48
x^-1 = -y/48
-1 < 0
1/(x^1) = -y/48 // * x^1
1 = x^1*(-y/48) // : -y/48
-48*y^-1 = x^1
x = -48*y^-1
x = -48*y^-1
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