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d in (-oo:+oo)
1/2-(9*d) = 2 // - 2
1/2-(9*d)-2 = 0
1/2-9*d-2 = 0
-9*d-3/2 = 0 // + 3/2
-9*d = 3/2 // : -9
d = 3/2/(-9)
d = -1/6
d = -1/6
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