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D( x )
x-5 = 0
x-5 = 0
x-5 = 0
x-5 = 0 // + 5
x = 5
x in (-oo:5) U (5:+oo)
10/(x-5)+x = (2*x)/(x-5)+1 // - (2*x)/(x-5)+1
10/(x-5)-((2*x)/(x-5))+x-1 = 0
10/(x-5)-2*x*(x-5)^-1+x-1 = 0
10/(x-5)+(-2*x)/(x-5)+x-1 = 0
10/(x-5)+(-2*x)/(x-5)+(x*(x-5))/(x-5)+(-1*(x-5))/(x-5) = 0
x*(x-5)-1*(x-5)-2*x+10 = 0
x^2-2*x-5*x-x+5+10 = 0
x^2-7*x-x+5+10 = 0
x^2-8*x+15 = 0
x^2-8*x+15 = 0
x^2-8*x+15 = 0
DELTA = (-8)^2-(1*4*15)
DELTA = 4
DELTA > 0
x = (4^(1/2)+8)/(1*2) or x = (8-4^(1/2))/(1*2)
x = 5 or x = 3
(x-3)*(x-5) = 0
((x-3)*(x-5))/(x-5) = 0
((x-3)*(x-5))/(x-5) = 0 // * x-5
(x-3)*(x-5) = 0
( x-3 )
x-3 = 0 // + 3
x = 3
( x-5 )
x-5 = 0 // + 5
x = 5
x in { 5}
x = 3
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