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d in (-oo:+oo)
-19 = (-1/2)*d // - (-1/2)*d
-((-1/2)*d)-19 = 0
(1/2)*d-19 = 0
1/2*d-19 = 0 // + 19
1/2*d = 19 // : 1/2
d = 19/1/2
d = 38
d = 38
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