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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4/x = 24/42 // - 24/42
4/x-(24/42) = 0
4/x-4/7 = 0
4*x^-1 = 4/7 // : 4
x^-1 = 1/7
-1 < 0
1/(x^1) = 1/7 // * x^1
1 = 1/7*x^1 // : 1/7
7 = x^1
x = 7
x = 7
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