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D( x )
x = 0
x-9 = 0
x = 0
x = 0
x-9 = 0
x-9 = 0
x-9 = 0 // + 9
x = 9
x in (-oo:0) U (0:9) U (9:+oo)
4/(x-9)+10/x = 6 // - 6
4/(x-9)+10/x-6 = 0
(4*x)/(x*(x-9))+(10*(x-9))/(x*(x-9))+(-6*x*(x-9))/(x*(x-9)) = 0
10*(x-9)-6*x*(x-9)+4*x = 0
14*x-6*x^2+54*x-90 = 0
68*x-6*x^2-90 = 0
68*x-6*x^2-90 = 0
2*(34*x-3*x^2-45) = 0
34*x-3*x^2-45 = 0
DELTA = 34^2-(-45*(-3)*4)
DELTA = 616
DELTA > 0
x = (616^(1/2)-34)/(-3*2) or x = (-616^(1/2)-34)/(-3*2)
x = (2*154^(1/2)-34)/(-6) or x = (-2*154^(1/2)-34)/(-6)
2*(x-((2*154^(1/2)-34)/(-6)))*(x-((-2*154^(1/2)-34)/(-6))) = 0
(2*(x-((2*154^(1/2)-34)/(-6)))*(x-((-2*154^(1/2)-34)/(-6))))/(x*(x-9)) = 0
(2*(x-((2*154^(1/2)-34)/(-6)))*(x-((-2*154^(1/2)-34)/(-6))))/(x*(x-9)) = 0 // * x*(x-9)
2*(x-((2*154^(1/2)-34)/(-6)))*(x-((-2*154^(1/2)-34)/(-6))) = 0
( x-((-2*154^(1/2)-34)/(-6)) )
x-((-2*154^(1/2)-34)/(-6)) = 0 // + (-2*154^(1/2)-34)/(-6)
x = (-2*154^(1/2)-34)/(-6)
( x-((2*154^(1/2)-34)/(-6)) )
x-((2*154^(1/2)-34)/(-6)) = 0 // + (2*154^(1/2)-34)/(-6)
x = (2*154^(1/2)-34)/(-6)
x in { (-2*154^(1/2)-34)/(-6), (2*154^(1/2)-34)/(-6) }
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