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D( x )
3*x-3 = 0
3*x-3 = 0
3*x-3 = 0
3*x-3 = 0 // + 3
3*x = 3 // : 3
x = 3/3
x = 1
x in (-oo:1) U (1:+oo)
(6*x-18)/(3*x-3) = 5 // - 5
(6*x-18)/(3*x-3)-5 = 0
(6*x-18)/(3*x-3)+(-5*(3*x-3))/(3*x-3) = 0
6*x-5*(3*x-3)-18 = 0
-9*x-3 = 0
(-9*x-3)/(3*x-3) = 0
(-9*x-3)/(3*x-3) = 0 // * 3*x-3
-9*x-3 = 0
-9*x-3 = 0 // + 3
-9*x = 3 // : -9
x = 3/(-9)
x = -1/3
x = -1/3
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