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f in (-oo:+oo)
((f+108)^1)/2 = 73 // - 73
((f+108)^1)/2-73 = 0
(f+108)/2-73 = 0
(f+108)/2+(-73*2)/2 = 0
f-73*2+108 = 0
f-38 = 0
(f-38)/2 = 0
(f-38)/2 = 0 // * 2
f-38 = 0
f-38 = 0 // + 38
f = 38
f = 38
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