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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(3*x+3)/x-2 = 5/6 // - 5/6
(3*x+3)/x-(5/6)-2 = 0
(3*x+3)/x-5/6-2 = 0
(6*(3*x+3))/(6*x)+(-5*x)/(6*x)+(-2*6*x)/(6*x) = 0
6*(3*x+3)-5*x-2*6*x = 0
13*x-12*x+18 = 0
x+18 = 0
(x+18)/(6*x) = 0
(x+18)/(6*x) = 0 // * 6*x
x+18 = 0
x+18 = 0 // - 18
x = -18
x = -18
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