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D( x )
x+2 = 0
x+2 = 0
x+2 = 0
x+2 = 0 // - 2
x = -2
x in (-oo:-2) U (-2:+oo)
(2*x-1)/(x+2) = 6/5 // - 6/5
(2*x-1)/(x+2)-(6/5) = 0
(2*x-1)/(x+2)-6/5 = 0
(5*(2*x-1))/(5*(x+2))+(-6*(x+2))/(5*(x+2)) = 0
5*(2*x-1)-6*(x+2) = 0
4*x-17 = 0
(4*x-17)/(5*(x+2)) = 0
(4*x-17)/(5*(x+2)) = 0 // * 5*(x+2)
4*x-17 = 0
4*x-17 = 0 // + 17
4*x = 17 // : 4
x = 17/4
x = 17/4
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