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D( x )
2*x+1 = 0
x-1 = 0
2*x+1 = 0
2*x+1 = 0
2*x+1 = 0 // - 1
2*x = -1 // : 2
x = -1/2
x-1 = 0
x-1 = 0
x-1 = 0 // + 1
x = 1
x in (-oo:-1/2) U (-1/2:1) U (1:+oo)
((-8*x-7)/(x-1))*((-8*x-7)/(2*x+1)) = 72 // - 72
((-8*x-7)/(x-1))*((-8*x-7)/(2*x+1))-72 = 0
((-8*x-7)^2)/((x-1)*(2*x+1))-72 = 0
((-8*x-7)^2)/((x-1)*(2*x+1))+(-72*(x-1)*(2*x+1))/((x-1)*(2*x+1)) = 0
(-8*x-7)^2-72*(x-1)*(2*x+1) = 0
184*x-80*x^2+121 = 0
184*x-80*x^2+121 = 0
184*x-80*x^2+121 = 0
DELTA = 184^2-(-80*4*121)
DELTA = 72576
DELTA > 0
x = (72576^(1/2)-184)/(-80*2) or x = (-72576^(1/2)-184)/(-80*2)
x = (72*14^(1/2)-184)/(-160) or x = (-72*14^(1/2)-184)/(-160)
(x-((72*14^(1/2)-184)/(-160)))*(x-((-72*14^(1/2)-184)/(-160))) = 0
((x-((72*14^(1/2)-184)/(-160)))*(x-((-72*14^(1/2)-184)/(-160))))/((x-1)*(2*x+1)) = 0
((x-((72*14^(1/2)-184)/(-160)))*(x-((-72*14^(1/2)-184)/(-160))))/((x-1)*(2*x+1)) = 0 // * (x-1)*(2*x+1)
(x-((72*14^(1/2)-184)/(-160)))*(x-((-72*14^(1/2)-184)/(-160))) = 0
( x-((-72*14^(1/2)-184)/(-160)) )
x-((-72*14^(1/2)-184)/(-160)) = 0 // + (-72*14^(1/2)-184)/(-160)
x = (-72*14^(1/2)-184)/(-160)
( x-((72*14^(1/2)-184)/(-160)) )
x-((72*14^(1/2)-184)/(-160)) = 0 // + (72*14^(1/2)-184)/(-160)
x = (72*14^(1/2)-184)/(-160)
x in { (-72*14^(1/2)-184)/(-160), (72*14^(1/2)-184)/(-160) }
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