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f in (-oo:+oo)
(20/7)*f = 1/3 // - 1/3
(20/7)*f-(1/3) = 0
(20/7)*f-1/3 = 0
20/7*f-1/3 = 0 // + 1/3
20/7*f = 1/3 // : 20/7
f = 1/3/20/7
f = 7/60
f = 7/60
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