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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/x+4 = 4*(3/x-2) // - 4*(3/x-2)
5/x-(4*(3/x-2))+4 = 0
5/x-4*(3/x-2)+4 = 0
5/x-4*(3*x^-1-2)+4 = 0
(-4*x*(3*x^-1-2))/x+5/x+(4*x)/x = 0
4*x-4*x*(3*x^-1-2)+5 = 0
8*x+4*x-7 = 0
12*x-7 = 0
(12*x-7)/x = 0
(12*x-7)/x = 0 // * x
12*x-7 = 0
12*x-7 = 0 // + 7
12*x = 7 // : 12
x = 7/12
x = 7/12
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