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f in (-oo:+oo)
f/25-(2/9) = 2/9 // - 2/9
f/25-(2/9)-(2/9) = 0
f/25-2/9-2/9 = 0
1/25*f-4/9 = 0 // + 4/9
1/25*f = 4/9 // : 1/25
f = 4/9/1/25
f = 100/9
f = 100/9
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