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D( x )
10-x = 0
10-x = 0
10-x = 0
10-x = 0 // - 10
-x = -10 // * -1
x = 10
x in (-oo:10) U (10:+oo)
(18-(5*x))/(10-x) = 0
(18-5*x)/(10-x) = 0
18-5*x = 0 // - 18
-5*x = -18 // : -5
x = -18/(-5)
x = 18/5
x = 18/5
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