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f in (-oo:+oo)
(39/5)*f-(5/6) = (7/30)*f // - (7/30)*f
(39/5)*f-((7/30)*f)-(5/6) = 0
(39/5)*f+(-7/30)*f-5/6 = 0
227/30*f-5/6 = 0 // + 5/6
227/30*f = 5/6 // : 227/30
f = 5/6/227/30
f = 25/227
f = 25/227
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