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d in (-oo:+oo)
1280-((80*d)/32) = 0
(-5/2)*d+1280 = 0
1280-5/2*d = 0 // - 1280
-5/2*d = -1280 // : -5/2
d = -1280/(-5/2)
d = 512
d = 512
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