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D( x )
8-(0.1*x) = 0
8-(0.1*x) = 0
8-(0.1*x) = 0
8-0.1*x = 0
8-0.1*x = 0 // - 8
-0.1*x = -8 // : -0.1
x = -8/(-0.1)
x = 80
x in (-oo:80) U (80:+oo)
306/(8-(0.1*x)) = 0
306/(8-0.1*x) = 0
x belongs to the empty set
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