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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4 = 74/x // - 74/x
4-(74/x) = 0
4-74*x^-1 = 0
-74*x^-1 = -4 // : -74
x^-1 = 2/37
-1 < 0
1/(x^1) = 2/37 // * x^1
1 = 2/37*x^1 // : 2/37
37/2 = x^1
x = 37/2
x = 37/2
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