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f in (-oo:+oo)
(7/9)*f+8 = 19 // - 19
(7/9)*f-19+8 = 0
7/9*f-11 = 0 // + 11
7/9*f = 11 // : 7/9
f = 11/7/9
f = 99/7
f = 99/7
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