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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(2*x-5)/x = (x-2)/3 // - (x-2)/3
(2*x-5)/x-((x-2)/3) = 0
(2*x-5)/x+(-1*(x-2))/3 = 0
(3*(2*x-5))/(3*x)+(-1*x*(x-2))/(3*x) = 0
3*(2*x-5)-1*x*(x-2) = 0
8*x-x^2-15 = 0
8*x-x^2-15 = 0
8*x-x^2-15 = 0
DELTA = 8^2-(-15*(-1)*4)
DELTA = 4
DELTA > 0
x = (4^(1/2)-8)/(-1*2) or x = (-4^(1/2)-8)/(-1*2)
x = 3 or x = 5
(x-3)*(x-5) = 0
((x-3)*(x-5))/(3*x) = 0
((x-3)*(x-5))/(3*x) = 0 // * 3*x
(x-3)*(x-5) = 0
( x-3 )
x-3 = 0 // + 3
x = 3
( x-5 )
x-5 = 0 // + 5
x = 5
x in { 3, 5 }
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