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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)
1/(x-5)+10 = x/(x-5) // - x/(x-5)
1/(x-5)-(x/(x-5))+10 = 0
1/(x-5)+(-1*x)/(x-5)+10 = 0
1/(x-5)+(-1*x)/(x-5)+(10*(x-5))/(x-5) = 0
10*(x-5)-1*x+1 = 0
10*x-x-50+1 = 0
9*x-49 = 0
(9*x-49)/(x-5) = 0
(9*x-49)/(x-5) = 0 // * x-5
9*x-49 = 0
9*x-49 = 0 // + 49
9*x = 49 // : 9
x = 49/9
x = 49/9
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