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f in (-oo:+oo)
4/3 = f/45 // - f/45
4/3-(f/45) = 0
4/3-1/45*f = 0 // - 4/3
-1/45*f = -4/3 // : -1/45
f = -4/3/(-1/45)
f = 60
f = 60
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