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d in (-oo:+oo)
-9 = (-1/2)*d // - (-1/2)*d
-((-1/2)*d)-9 = 0
(1/2)*d-9 = 0
1/2*d-9 = 0 // + 9
1/2*d = 9 // : 1/2
d = 9/1/2
d = 18
d = 18
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