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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-(2/(x+3)) = 0
6/x-2*(x+3)^-1 = 0
6/x-2/(x+3) = 0
(-2*x)/(x*(x+3))+(6*(x+3))/(x*(x+3)) = 0
6*(x+3)-2*x = 0
4*x+18 = 0
(4*x+18)/(x*(x+3)) = 0
(4*x+18)/(x*(x+3)) = 0 // * x*(x+3)
4*x+18 = 0
4*x+18 = 0 // - 18
4*x = -18 // : 4
x = -18/4
x = -9/2
x = -9/2
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