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D( x )
2*x-10 = 0
2*x-10 = 0
2*x-10 = 0
2*x-10 = 0 // + 10
2*x = 10 // : 2
x = 10/2
x = 5
x in (-oo:5) U (5:+oo)
1/(2*x-10) = 5 // - 5
1/(2*x-10)-5 = 0
1/(2*x-10)+(-5*(2*x-10))/(2*x-10) = 0
1-5*(2*x-10) = 0
51-10*x = 0
(51-10*x)/(2*x-10) = 0
(51-10*x)/(2*x-10) = 0 // * 2*x-10
51-10*x = 0
51-10*x = 0 // - 51
-10*x = -51 // : -10
x = -51/(-10)
x = 51/10
x = 51/10
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