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f in (-oo:+oo)
(26/7)*f = 1/3 // - 1/3
(26/7)*f-(1/3) = 0
(26/7)*f-1/3 = 0
26/7*f-1/3 = 0 // + 1/3
26/7*f = 1/3 // : 26/7
f = 1/3/26/7
f = 7/78
f = 7/78
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