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f in (-oo:+oo)
(1/7)*f-5.5 = 9/14 // - 9/14
(1/7)*f-(9/14)-5.5 = 0
(1/7)*f-9/14-5.5 = 0
1/7*f-6.14285714 = 0 // + 6.14285714
1/7*f = 6.14285714 // : 1/7
f = 6.14285714/1/7
f = 43.00000084
f = 43.00000084
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