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D( x )
1-3*x = 0
1-3*x = 0
1-3*x = 0
1-3*x = 0 // - 1
-3*x = -1 // : -3
x = -1/(-3)
x = 1/3
x in (-oo:1/3) U (1/3:+oo)
((8*(x-3))/(1-3*x))*(2-x) = 0
(8*(x-3)*(2-x))/(1-3*x) = 0
( 2-x )
2-x = 0 // - 2
-x = -2 // * -1
x = 2
( x-3 )
x-3 = 0 // + 3
x = 3
x in { 2, 3 }
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