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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
8*x-(((6*(8/x)*x^2)/9)*x)-9 = o // - o
8*x-o-(((6*(8/x)*x^2)/9)*x)-9 = 0
(-16/3)*x^2-o+8*x-9 = 0
8*x-o-16/3*x^2-9 = 0
DELTA = 8^2-(-16/3*4*(-o-9))
DELTA = 64-64/3*(o+9)
64-64/3*(o+9) = 0
64-64/3*(o+9) = 0
-64/3*o-128 = 0
-64/3*o-128 = 0
-64/3*o-128 = 0 // + 128
-64/3*o = 128 // : -64/3
o = 128/(-64/3)
o = -6
DELTA = 0 <=> t_1 = -6
x = -8/(-16/3*2) i o = -6
x = 3/4 i o = -6
( x = ((64-64/3*(o+9))^(1/2)-8)/(-16/3*2) or x = (-(64-64/3*(o+9))^(1/2)-8)/(-16/3*2) ) i o > -6
( x = -3/32*((64-64/3*(o+9))^(1/2)-8) or x = 3/32*((64-64/3*(o+9))^(1/2)+8) ) i o > -6
o+6 > 0
o+6 > 0 // - 6
o > -6
x in { 3/4, -3/32*((64-64/3*(o+9))^(1/2)-8), 3/32*((64-64/3*(o+9))^(1/2)+8) }
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