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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)
36/(x+3) = 3 // - 3
36/(x+3)-3 = 0
36/(x+3)+(-3*(x+3))/(x+3) = 0
36-3*(x+3) = 0
27-3*x = 0
(27-3*x)/(x+3) = 0
(27-3*x)/(x+3) = 0 // * x+3
27-3*x = 0
27-3*x = 0 // - 27
-3*x = -27 // : -3
x = -27/(-3)
x = 9
x = 9
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