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f in (-oo:+oo)
f/5-2.2 = 2.5 // - 2.5
f/5-2.5-2.2 = 0
1/5*f-4.7 = 0 // + 4.7
1/5*f = 4.7 // : 1/5
f = 4.7/1/5
f = 23.5
f = 23.5
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