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D( x )
8*x-7 = 0
8*x-7 = 0
8*x-7 = 0
8*x-7 = 0 // + 7
8*x = 7 // : 8
x = 7/8
x in (-oo:7/8) U (7/8:+oo)
(3*x+5)/(8*x-7) = 0
3*x+5 = 0 // - 5
3*x = -5 // : 3
x = -5/3
x = -5/3
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