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D( x )
x^2-(2*x) = 0
x^2-(2*x) = 0
x^2-(2*x) = 0
x^2-2*x = 0
x^2-2*x = 0
DELTA = (-2)^2-(0*1*4)
DELTA = 4
DELTA > 0
x = (4^(1/2)+2)/(1*2) or x = (2-4^(1/2))/(1*2)
x = 2 or x = 0
x in (-oo:0) U (0:2) U (2:+oo)
(7*x-14)/(x^2-(2*x)) = 0
(7*x-14)/(x^2-2*x) = 0
x^2-2*x = 0
x*(x-2) = 0
x-2 = 0 // + 2
x = 2
x*(x-2) = 0
(7*x-14)/(x*(x-2)) = 0
7*x-14 = 0 // + 14
7*x = 14 // : 7
x = 14/7
x = 2
x in { 2}
x belongs to the empty set
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