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