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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/x-(3/2) = 7/x // - 7/x
1/x-(7/x)-(3/2) = 0
1/x-7*x^-1-3/2 = 0
-6*x^-1 = 3/2 // : -6
x^-1 = -1/4
-1 < 0
1/(x^1) = -1/4 // * x^1
1 = -1/4*x^1 // : -1/4
-4 = x^1
x = -4
x = -4
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