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f in (-oo:+oo)
f/40-(2/10) = 1/10 // - 1/10
f/40-(2/10)-(1/10) = 0
f/40-1/5-1/10 = 0
1/40*f-3/10 = 0 // + 3/10
1/40*f = 3/10 // : 1/40
f = 3/10/1/40
f = 12
f = 12
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