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f in (-oo:+oo)
(7*f)/11-(7/11) = 0
(7*f)/11-7/11 = 0
7/11*f-7/11 = 0 // + 7/11
7/11*f = 7/11 // : 7/11
f = 7/11/7/11
f = 1
f = 1
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