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D( x )
4*x-7 = 0
4*x-7 = 0
4*x-7 = 0
4*x-7 = 0 // + 7
4*x = 7 // : 4
x = 7/4
x in (-oo:7/4) U (7/4:+oo)
(x-3)/(4*x-7) = 0
x-3 = 0 // + 3
x = 3
x = 3
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