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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
10 = 142/x // - 142/x
10-(142/x) = 0
10-142*x^-1 = 0
-142*x^-1 = -10 // : -142
x^-1 = 5/71
-1 < 0
1/(x^1) = 5/71 // * x^1
1 = 5/71*x^1 // : 5/71
71/5 = x^1
x = 71/5
x = 71/5
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