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D( x )
2*x-5 = 0
2*x-5 = 0
2*x-5 = 0
2*x-5 = 0 // + 5
2*x = 5 // : 2
x = 5/2
x in (-oo:5/2) U (5/2:+oo)
(7*x+10)/(2*x-5) = 0
7*x+10 = 0 // - 10
7*x = -10 // : 7
x = -10/7
x = -10/7
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