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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+30)/(x-3) = -4 // + 4
(5*x+30)/(x-3)+4 = 0
(5*x+30)/(x-3)+(4*(x-3))/(x-3) = 0
4*(x-3)+5*x+30 = 0
9*x+18 = 0
(9*x+18)/(x-3) = 0
(9*x+18)/(x-3) = 0 // * x-3
9*x+18 = 0
9*x+18 = 0 // - 18
9*x = -18 // : 9
x = -18/9
x = -2
x = -2
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