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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1.8/35 = 1.6/x // - 1.6/x
1.8/35-(1.6/x) = 0
1.8/35-1.6*x^-1 = 0
-1.6*x^-1 = -0.05142857 // : -1.6
x^-1 = 0.03214286
-1 < 0
1/(x^1) = 0.03214286 // * x^1
1 = 0.03214286*x^1 // : 0.03214286
31.11110835 = x^1
x = 31.11110835
x = 31.11110835
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