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f in (-oo:+oo)
f-(9/(-3)) = 11-f // - 11-f
f+f-(9/(-3))-11 = 0
f+f-11+3 = 0
2*f-8 = 0 // + 8
2*f = 8 // : 2
f = 8/2
f = 4
f = 4
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