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f in (-oo:+oo)
f/54-(1/9) = 5/9 // - 5/9
f/54-(1/9)-(5/9) = 0
f/54-1/9-5/9 = 0
1/54*f-2/3 = 0 // + 2/3
1/54*f = 2/3 // : 1/54
f = 2/3/1/54
f = 36
f = 36
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