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D( x )
x-10 = 0
x-10 = 0
x-10 = 0
x-10 = 0 // + 10
x = 10
x in (-oo:10) U (10:+oo)
0.2 = 1/(x-10) // - 1/(x-10)
0.2-(1/(x-10)) = 0
0.2-(x-10)^-1 = 0
0.2-1/(x-10) = 0
(0.2*(x-10))/(x-10)-1/(x-10) = 0
0.2*(x-10)-1 = 0
0.2*x-3 = 0
(0.2*x-3)/(x-10) = 0
(0.2*x-3)/(x-10) = 0 // * x-10
0.2*x-3 = 0
0.2*x-3 = 0 // + 3
0.2*x = 3 // : 0.2
x = 3/0.2
x = 15
x = 15
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