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F in (-oo:+oo)
F/2+1/5 = 21/10 // - 21/10
F/2+1/5-(21/10) = 0
F/2+1/5-21/10 = 0
1/2*F-19/10 = 0 // + 19/10
1/2*F = 19/10 // : 1/2
F = 19/10/1/2
F = 19/5
F = 19/5
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