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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
10/x = 7/42 // - 7/42
10/x-(7/42) = 0
10/x-1/6 = 0
10*x^-1 = 1/6 // : 10
x^-1 = 1/60
-1 < 0
1/(x^1) = 1/60 // * x^1
1 = 1/60*x^1 // : 1/60
60 = x^1
x = 60
x = 60
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