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D( x )
x-3 = 0
x-3 = 0
x-3 = 0
x-3 = 0 // + 3
x = 3
x in (-oo:3) U (3:+oo)
(2*x+1)/(x-3) = 6/7 // - 6/7
(2*x+1)/(x-3)-(6/7) = 0
(2*x+1)/(x-3)-6/7 = 0
(7*(2*x+1))/(7*(x-3))+(-6*(x-3))/(7*(x-3)) = 0
7*(2*x+1)-6*(x-3) = 0
8*x+25 = 0
(8*x+25)/(7*(x-3)) = 0
(8*x+25)/(7*(x-3)) = 0 // * 7*(x-3)
8*x+25 = 0
8*x+25 = 0 // - 25
8*x = -25 // : 8
x = -25/8
x = -25/8
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