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f in (-oo:+oo)
f/4 = 3.2 // - 3.2
f/4-3.2 = 0
1/4*f-3.2 = 0 // + 3.2
1/4*f = 3.2 // : 1/4
f = 3.2/1/4
f = 12.8
f = 12.8
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