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f in (-oo:+oo)
f/8-(2/9) = 5/9 // - 5/9
f/8-(2/9)-(5/9) = 0
f/8-2/9-5/9 = 0
1/8*f-7/9 = 0 // + 7/9
1/8*f = 7/9 // : 1/8
f = 7/9/1/8
f = 56/9
f = 56/9
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