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D( u )
u-6 = 0
u-6 = 0
u-6 = 0
u-6 = 0 // + 6
u = 6
u in (-oo:6) U (6:+oo)
((u^2-4)/(u-6))*(u-2) = 0
((u^2-4)*(u-2))/(u-6) = 0
( u-2 )
u-2 = 0 // + 2
u = 2
( u^2-4 )
1*u^2 = 4 // : 1
u^2 = 4
u^2 = 4 // ^ 1/2
abs(u) = 2
u = 2 or u = -2
u in { 2, 2, -2 }
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