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D( x )
x-6 = 0
x-6 = 0
x-6 = 0
x-6 = 0 // + 6
x = 6
x in (-oo:6) U (6:+oo)
(-5/2)*(x-6) = 8/(x-6) // - 8/(x-6)
(-5/2)*(x-6)-(8/(x-6)) = 0
(-5/2)*(x-6)-8*(x-6)^-1 = 0
-5/2*(x-6)-8/(x-6) = 0
(-5/2*(x-6)^2)/(x-6)-8/(x-6) = 0
-5/2*(x-6)^2-8 = 0
30*x-5/2*x^2-98 = 0
30*x-5/2*x^2-98 = 0
30*x-5/2*x^2-98 = 0
DELTA = 30^2-(-98*(-5/2)*4)
DELTA = -80
DELTA < 0
1 = 0
1/(x-6) = 0
1/(x-6) = 0 // * x-6
1 = 0
x belongs to the empty set
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