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f in (-oo:+oo)
2*f = 1/6 // - 1/6
2*f-(1/6) = 0
2*f-1/6 = 0
2*f-1/6 = 0 // + 1/6
2*f = 1/6 // : 2
f = 1/6/2
f = 1/12
f = 1/12
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