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D( x )
x = 0
x+3 = 0
x = 0
x = 0
x+3 = 0
x+3 = 0
x+3 = 0 // - 3
x = -3
x in (-oo:-3) U (-3:0) U (0:+oo)
-6/x = -15/(x+3) // + -15/(x+3)
-(-15/(x+3))-6/x = 0
15*(x+3)^-1-6/x = 0
15/(x+3)-6/x = 0
(15*x)/(x*(x+3))+(-6*(x+3))/(x*(x+3)) = 0
15*x-6*(x+3) = 0
9*x-18 = 0
(9*x-18)/(x*(x+3)) = 0
(9*x-18)/(x*(x+3)) = 0 // * x*(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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