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D( x )
7/1-(8*x) = 0
7/1-(8*x) = 0
7/1-(8*x) = 0
7-8*x = 0
7-8*x = 0 // - 7
-8*x = -7 // : -8
x = -7/(-8)
x = 7/8
x in (-oo:7/8) U (7/8:+oo)
1/(7/1-(8*x)) = 0
1/(7-8*x) = 0
x belongs to the empty set
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