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D( x )
x = 0
7*x+3 = 0
x = 0
x = 0
7*x+3 = 0
7*x+3 = 0
7*x+3 = 0 // - 3
7*x = -3 // : 7
x = -3/7
x in (-oo:-3/7) U (-3/7:0) U (0:+oo)
(14*x-5)/(7*x+3) = 2-(4/x) // - 2-(4/x)
(14*x-5)/(7*x+3)+4/x-2 = 0
(x*(14*x-5))/(x*(7*x+3))+(4*(7*x+3))/(x*(7*x+3))+(-2*x*(7*x+3))/(x*(7*x+3)) = 0
x*(14*x-5)+4*(7*x+3)-2*x*(7*x+3) = 0
14*x^2-14*x^2+23*x-6*x+12 = 0
17*x+12 = 0
(17*x+12)/(x*(7*x+3)) = 0
(17*x+12)/(x*(7*x+3)) = 0 // * x*(7*x+3)
17*x+12 = 0
17*x+12 = 0 // - 12
17*x = -12 // : 17
x = -12/17
x = -12/17
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