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D( x )
x-1 = 0
x-1 = 0
x-1 = 0
x-1 = 0 // + 1
x = 1
x in (-oo:1) U (1:+oo)
(3*x^2-(7*x))/(x-1) = 0
(3*x^2-7*x)/(x-1) = 0
3*x^2-7*x = 0
x*(3*x-7) = 0
3*x-7 = 0 // + 7
3*x = 7 // : 3
x = 7/3
x*(x-7/3) = 0
(x*(x-7/3))/(x-1) = 0
( x-7/3 )
x-7/3 = 0 // + 7/3
x = 7/3
( x )
x = 0
x in { 7/3, 0 }
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