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D in (-oo:+oo)
(D-7)*(D+3/4) = 0
( D+3/4 )
D+3/4 = 0 // - 3/4
D = -3/4
( D-7 )
D-7 = 0 // + 7
D = 7
D in { -3/4, 7 }
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