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D( x )
2*x-4 = 0
3*x-6 = 0
2*x-4 = 0
2*x-4 = 0
2*x-4 = 0 // + 4
2*x = 4 // : 2
x = 4/2
x = 2
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)
3/(2*x-4)-(5/(3*x-6)) = 3/5 // - 3/5
3/(2*x-4)-(5/(3*x-6))-(3/5) = 0
3/(2*x-4)-5*(3*x-6)^-1-3/5 = 0
3/(2*x-4)-5/(3*x-6)-3/5 = 0
(3*5*(3*x-6))/(5*(2*x-4)*(3*x-6))+(-5*5*(2*x-4))/(5*(2*x-4)*(3*x-6))+(-3*(2*x-4)*(3*x-6))/(5*(2*x-4)*(3*x-6)) = 0
3*5*(3*x-6)-5*5*(2*x-4)-3*(2*x-4)*(3*x-6) = 0
72*x-18*x^2-5*x-72+10 = 0
67*x-18*x^2-62 = 0
67*x-18*x^2-62 = 0
67*x-18*x^2-62 = 0
DELTA = 67^2-(-62*(-18)*4)
DELTA = 25
DELTA > 0
x = (25^(1/2)-67)/(-18*2) or x = (-25^(1/2)-67)/(-18*2)
x = 31/18 or x = 2
(x-31/18)*(x-2) = 0
((x-31/18)*(x-2))/(5*(2*x-4)*(3*x-6)) = 0
((x-31/18)*(x-2))/(5*(2*x-4)*(3*x-6)) = 0 // * 5*(2*x-4)*(3*x-6)
(x-31/18)*(x-2) = 0
( x-2 )
x-2 = 0 // + 2
x = 2
( x-31/18 )
x-31/18 = 0 // + 31/18
x = 31/18
x in { 2}
x = 31/18
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