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f in (-oo:+oo)
f/6 = 2.6 // - 2.6
f/6-2.6 = 0
1/6*f-2.6 = 0 // + 2.6
1/6*f = 2.6 // : 1/6
f = 2.6/1/6
f = 15.59999969
f = 15.59999969
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