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D( x )
2*x-4 = 0
2*x-4 = 0
2*x-4 = 0
2*x-4 = 0 // + 4
2*x = 4 // : 2
x = 4/2
x = 2
x in (-oo:2) U (2:+oo)
(x+6)/39 = 24/(2*x-4) // - 24/(2*x-4)
(x+6)/39-(24/(2*x-4)) = 0
(x+6)/39-24*(2*x-4)^-1 = 0
(x+6)/39-24/(2*x-4) = 0
((x+6)*(2*x-4))/(39*(2*x-4))+(-24*39)/(39*(2*x-4)) = 0
(x+6)*(2*x-4)-24*39 = 0
2*x^2+8*x-960 = 0
2*x^2+8*x-960 = 0
2*(x^2+4*x-480) = 0
x^2+4*x-480 = 0
DELTA = 4^2-(-480*1*4)
DELTA = 1936
DELTA > 0
x = (1936^(1/2)-4)/(1*2) or x = (-1936^(1/2)-4)/(1*2)
x = 20 or x = -24
2*(x+24)*(x-20) = 0
(2*(x+24)*(x-20))/(39*(2*x-4)) = 0
(2*(x+24)*(x-20))/(39*(2*x-4)) = 0 // * 39*(2*x-4)
2*(x+24)*(x-20) = 0
( x+24 )
x+24 = 0 // - 24
x = -24
( x-20 )
x-20 = 0 // + 20
x = 20
x in { -24, 20 }
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