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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)
(5*x)/(x-3) = 4/3 // - 4/3
(5*x)/(x-3)-(4/3) = 0
(5*x)/(x-3)-4/3 = 0
(3*5*x)/(3*(x-3))+(-4*(x-3))/(3*(x-3)) = 0
3*5*x-4*(x-3) = 0
11*x+12 = 0
(11*x+12)/(3*(x-3)) = 0
(11*x+12)/(3*(x-3)) = 0 // * 3*(x-3)
11*x+12 = 0
11*x+12 = 0 // - 12
11*x = -12 // : 11
x = -12/11
x = -12/11
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