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f in (-oo:+oo)
(2*f)/7 = f-(2/14) // - f-(2/14)
(2*f)/7-f+2/14 = 0
1/7-5/7*f = 0 // - 1/7
-5/7*f = -1/7 // : -5/7
f = -1/7/(-5/7)
f = 1/5
f = 1/5
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