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f in (-oo:+oo)
3*f-(2/5) = 5 // - 5
3*f-(2/5)-5 = 0
3*f-2/5-5 = 0
3*f-27/5 = 0 // + 27/5
3*f = 27/5 // : 3
f = 27/5/3
f = 9/5
f = 9/5
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