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f in (-oo:+oo)
18.5*f-2 = (1/6)*f // - (1/6)*f
18.5*f-((1/6)*f)-2 = 0
18.5*f+(-1/6)*f-2 = 0
18.33333333*f-2 = 0 // + 2
18.33333333*f = 2 // : 18.33333333
f = 2/18.33333333
f = 0.10909091
f = 0.10909091
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