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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4/x = 1.75 // - 1.75
4/x-1.75 = 0
4*x^-1 = 1.75 // : 4
x^-1 = 0.4375
-1 < 0
1/(x^1) = 0.4375 // * x^1
1 = 0.4375*x^1 // : 0.4375
2.28571429 = x^1
x = 2.28571429
x = 2.28571429
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