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f in (-oo:+oo)
f/7.9 = 5 // - 5
f/7.9-5 = 0
0.12658228*f-5 = 0 // + 5
0.12658228*f = 5 // : 0.12658228
f = 5/0.12658228
f = 39.49999953
f = 39.49999953
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