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f in (-oo:+oo)
f = 31/2-4.5-2.3 // - 31/2-4.5-2.3
f-(31/2)+2.3+4.5 = 0
f-31/2+2.3+4.5 = 0
f-8.7 = 0 // + 8.7
f = 8.7
f = 8.7
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