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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4.7 = 4/x // - 4/x
4.7-(4/x) = 0
4.7-4*x^-1 = 0
-4*x^-1 = -4.7 // : -4
x^-1 = 1.175
-1 < 0
1/(x^1) = 1.175 // * x^1
1 = 1.175*x^1 // : 1.175
0.85106383 = x^1
x = 0.85106383
x = 0.85106383
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