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d in (-oo:+oo)
1280-((80*d)/32) = 32 // - 32
1280-((80*d)/32)-32 = 0
(-5/2)*d-32+1280 = 0
1248-5/2*d = 0 // - 1248
-5/2*d = -1248 // : -5/2
d = -1248/(-5/2)
d = 2496/5
d = 2496/5
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