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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-3)/(7*x+3) = 2-(2/x) // - 2-(2/x)
(14*x-3)/(7*x+3)+2/x-2 = 0
(x*(14*x-3))/(x*(7*x+3))+(2*(7*x+3))/(x*(7*x+3))+(-2*x*(7*x+3))/(x*(7*x+3)) = 0
x*(14*x-3)+2*(7*x+3)-2*x*(7*x+3) = 0
14*x^2-14*x^2+11*x-6*x+6 = 0
5*x+6 = 0
(5*x+6)/(x*(7*x+3)) = 0
(5*x+6)/(x*(7*x+3)) = 0 // * x*(7*x+3)
5*x+6 = 0
5*x+6 = 0 // - 6
5*x = -6 // : 5
x = -6/5
x = -6/5
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