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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(x-5)/x-(3/7) = 5/x // - 5/x
(x-5)/x-(5/x)-(3/7) = 0
(x-5)/x-5*x^-1-3/7 = 0
(x-5)/x-5/x-3/7 = 0
(7*(x-5))/(7*x)+(-5*7)/(7*x)+(-3*x)/(7*x) = 0
7*(x-5)-3*x-5*7 = 0
7*x-3*x-70 = 0
4*x-70 = 0
(4*x-70)/(7*x) = 0
(4*x-70)/(7*x) = 0 // * 7*x
4*x-70 = 0
4*x-70 = 0 // + 70
4*x = 70 // : 4
x = 70/4
x = 35/2
x = 35/2
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