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D( x )
x^2-x-20 = 0
x^2-(10*x)+25 = 0
x^2-x-20 = 0
x^2-x-20 = 0
x^2-x-20 = 0
DELTA = (-1)^2-(-20*1*4)
DELTA = 81
DELTA > 0
x = (81^(1/2)+1)/(1*2) or x = (1-81^(1/2))/(1*2)
x = 5 or x = -4
x^2-(10*x)+25 = 0
x^2-(10*x)+25 = 0
x^2-10*x+25 = 0
x^2-10*x+25 = 0
DELTA = (-10)^2-(1*4*25)
DELTA = 0
x = 10/(1*2)
x = 5 or x = 5
x in (-oo:-4) U (-4:5) U (5:+oo)
(3*x)/(x^2-(10*x)+25)+(4*x)/(x^2-x-20) = 0
(3*x)/(x^2-10*x+25)+(4*x)/(x^2-x-20) = 0
x^2-10*x+25 = 0
x^2-10*x+25 = 0
x^2-10*x+25 = 0
DELTA = (-10)^2-(1*4*25)
DELTA = 0
x = 10/(1*2)
x = 5 or x = 5
(x-5)^2 = 0
x^2-x-20 = 0
x^2-x-20 = 0
x^2-x-20 = 0
DELTA = (-1)^2-(-20*1*4)
DELTA = 81
DELTA > 0
x = (81^(1/2)+1)/(1*2) or x = (1-81^(1/2))/(1*2)
x = 5 or x = -4
(x+4)*(x-5) = 0
(3*x)/((x-5)^2)+(4*x)/((x+4)*(x-5)) = 0
(3*x*(x+4))/((x-5)^2*(x+4))+(4*x*(x-5))/((x-5)^2*(x+4)) = 0
3*x*(x+4)+4*x*(x-5) = 0
7*x^2-8*x = 0
7*x^2-8*x = 0
x*(7*x-8) = 0
7*x-8 = 0 // + 8
7*x = 8 // : 7
x = 8/7
x*(x-8/7) = 0
(x*(x-8/7))/((x-5)^2*(x+4)) = 0
(x*(x-8/7))/((x-5)^2*(x+4)) = 0 // * (x-5)^2*(x+4)
x*(x-8/7) = 0
( x-8/7 )
x-8/7 = 0 // + 8/7
x = 8/7
( x )
x = 0
x in { 8/7, 0 }
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