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D( h )
5*h+1 = 0
5*h+1 = 0
5*h+1 = 0
5*h+1 = 0 // - 1
5*h = -1 // : 5
h = -1/5
h in (-oo:-1/5) U (-1/5:+oo)
(8*h-1)/(5*h+1) = 5/6 // - 5/6
(8*h-1)/(5*h+1)-(5/6) = 0
(8*h-1)/(5*h+1)-5/6 = 0
(6*(8*h-1))/(6*(5*h+1))+(-5*(5*h+1))/(6*(5*h+1)) = 0
6*(8*h-1)-5*(5*h+1) = 0
23*h-11 = 0
(23*h-11)/(6*(5*h+1)) = 0
(23*h-11)/(6*(5*h+1)) = 0 // * 6*(5*h+1)
23*h-11 = 0
23*h-11 = 0 // + 11
23*h = 11 // : 23
h = 11/23
h = 11/23
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