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f in (-oo:+oo)
(5/9)*f-(160/9) = -62.1 // + 62.1
(5/9)*f-(160/9)+62.1 = 0
(5/9)*f-160/9+62.1 = 0
5/9*f+44.32222222 = 0 // - 44.32222222
5/9*f = -44.32222222 // : 5/9
f = -44.32222222/5/9
f = -79.77999936
f = -79.77999936
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