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f in (-oo:+oo)
-361 = f/(-28)-348 // - f/(-28)-348
348-(f/(-28))-361 = 0
1/28*f-13 = 0 // + 13
1/28*f = 13 // : 1/28
f = 13/1/28
f = 364
f = 364
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