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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
7/x-(1/2)-3 = 3/x-4 // - 3/x-4
7/x-(3/x)-(1/2)-3+4 = 0
7/x-3*x^-1-1/2-3+4 = 0
4*x^-1 = -1/2 // : 4
x^-1 = -1/8
-1 < 0
1/(x^1) = -1/8 // * x^1
1 = -1/8*x^1 // : -1/8
-8 = x^1
x = -8
x = -8
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