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D( k )
7*k-3 = 0
7*k-3 = 0
7*k-3 = 0
7*k-3 = 0 // + 3
7*k = 3 // : 7
k = 3/7
k in (-oo:3/7) U (3/7:+oo)
(5*k-3)/(7*k-3) = 2/3 // - 2/3
(5*k-3)/(7*k-3)-(2/3) = 0
(5*k-3)/(7*k-3)-2/3 = 0
(3*(5*k-3))/(3*(7*k-3))+(-2*(7*k-3))/(3*(7*k-3)) = 0
3*(5*k-3)-2*(7*k-3) = 0
k-3 = 0
(k-3)/(3*(7*k-3)) = 0
(k-3)/(3*(7*k-3)) = 0 // * 3*(7*k-3)
k-3 = 0
k-3 = 0 // + 3
k = 3
k = 3
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