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d in (-oo:+oo)
321 = (5*d)/13+16 // - (5*d)/13+16
321-((5*d)/13)-16 = 0
(-5/13)*d-16+321 = 0
305-5/13*d = 0 // - 305
-5/13*d = -305 // : -5/13
d = -305/(-5/13)
d = 793
d = 793
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