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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
35/x-(15*(9*x+84)) = 5*(13*x+326) // - 5*(13*x+326)
35/x-(15*(9*x+84))-(5*(13*x+326)) = 0
35/x-15*(9*x+84)-5*(13*x+326) = 0
(-15*x*(9*x+84))/x+(-5*x*(13*x+326))/x+35/x = 0
35-15*x*(9*x+84)-5*x*(13*x+326) = 0
35-200*x^2-2890*x = 0
35-200*x^2-2890*x = 0
5*(7-40*x^2-578*x) = 0
7-40*x^2-578*x = 0
DELTA = (-578)^2-(-40*4*7)
DELTA = 335204
DELTA > 0
x = (335204^(1/2)+578)/(-40*2) or x = (578-335204^(1/2))/(-40*2)
x = (2*83801^(1/2)+578)/(-80) or x = (578-2*83801^(1/2))/(-80)
5*(x-((2*83801^(1/2)+578)/(-80)))*(x-((578-2*83801^(1/2))/(-80))) = 0
(5*(x-((2*83801^(1/2)+578)/(-80)))*(x-((578-2*83801^(1/2))/(-80))))/x = 0
(5*(x-((2*83801^(1/2)+578)/(-80)))*(x-((578-2*83801^(1/2))/(-80))))/x = 0 // * x
5*(x-((2*83801^(1/2)+578)/(-80)))*(x-((578-2*83801^(1/2))/(-80))) = 0
( x-((2*83801^(1/2)+578)/(-80)) )
x-((2*83801^(1/2)+578)/(-80)) = 0 // + (2*83801^(1/2)+578)/(-80)
x = (2*83801^(1/2)+578)/(-80)
( x-((578-2*83801^(1/2))/(-80)) )
x-((578-2*83801^(1/2))/(-80)) = 0 // + (578-2*83801^(1/2))/(-80)
x = (578-2*83801^(1/2))/(-80)
x in { (2*83801^(1/2)+578)/(-80), (578-2*83801^(1/2))/(-80) }
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