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f in (-oo:+oo)
508/776 = f/582 // - f/582
508/776-(f/582) = 0
127/194-1/582*f = 0 // - 127/194
-1/582*f = -127/194 // : -1/582
f = -127/194/(-1/582)
f = 381
f = 381
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