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D( x )
(8/7)*x-4 = 0
(8/7)*x-4 = 0
(8/7)*x-4 = 0
8/7*x-4 = 0 // + 4
8/7*x = 4 // : 8/7
x = 4/8/7
x = 7/2
x in (-oo:7/2) U (7/2:+oo)
8/((8/7)*x-4) = 0
8/(8/7*x-4) = 0
8 = 0
x belongs to the empty set
x belongs to the empty set
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