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F in (-oo:+oo)
F/2-F-(8/4) = 9/4 // - 9/4
F/2-F-(8/4)-(9/4) = 0
F/2-F-9/4-2 = 0
-1/2*F-17/4 = 0 // + 17/4
-1/2*F = 17/4 // : -1/2
F = 17/4/(-1/2)
F = -17/2
F = -17/2
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