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f in (-oo:+oo)
f/3 = 3.6 // - 3.6
f/3-3.6 = 0
1/3*f-3.6 = 0 // + 3.6
1/3*f = 3.6 // : 1/3
f = 3.6/1/3
f = 10.80000011
f = 10.80000011
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