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f in (-oo:+oo)
(f+4)/2 = -3 // + 3
(f+4)/2+3 = 0
(f+4)/2+(2*3)/2 = 0
f+2*3+4 = 0
f+10 = 0
(f+10)/2 = 0
(f+10)/2 = 0 // * 2
f+10 = 0
f+10 = 0 // - 10
f = -10
f = -10
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