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D( x )
3*x-6 = 0
3*x-6 = 0
3*x-6 = 0
3*x-6 = 0 // + 6
3*x = 6 // : 3
x = 6/3
x = 2
x in (-oo:2) U (2:+oo)
(5/3)*x-6+2 = -2/(3*x-6) // + -2/(3*x-6)
(5/3)*x-(-2/(3*x-6))-6+2 = 0
2*(3*x-6)^-1+(5/3)*x-6+2 = 0
2/(3*x-6)+(5*x)/3-6+2 = 0
(2*3)/(3*(3*x-6))+(5*x*(3*x-6))/(3*(3*x-6))+(-6*3*(3*x-6))/(3*(3*x-6))+(2*3*(3*x-6))/(3*(3*x-6)) = 0
5*x*(3*x-6)-6*3*(3*x-6)+2*3*(3*x-6)+2*3 = 0
15*x^2-30*x-54*x+18*x-36+6+108 = 0
15*x^2-84*x+18*x-36+114 = 0
15*x^2-66*x+78 = 0
15*x^2-66*x+78 = 0
3*(5*x^2-22*x+26) = 0
5*x^2-22*x+26 = 0
DELTA = (-22)^2-(4*5*26)
DELTA = -36
DELTA < 0
3 = 0
3/(3*(3*x-6)) = 0
3/(3*(3*x-6)) = 0 // * 3*(3*x-6)
3 = 0
x belongs to the empty set
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