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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4-(5/x) = 7/x // - 7/x
4-(5/x)-(7/x) = 0
4-5*x^-1-7*x^-1 = 0
-12*x^-1 = -4 // : -12
x^-1 = 1/3
-1 < 0
1/(x^1) = 1/3 // * x^1
1 = 1/3*x^1 // : 1/3
3 = x^1
x = 3
x = 3
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