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f in (-oo:+oo)
3/10-f = 4/5-(3/5) // - 4/5-(3/5)
3/10-f-(4/5)+3/5 = 0
3/10-f-4/5+3/5 = 0
1/10-f = 0 // - 1/10
-f = -1/10 // * -1
f = 1/10
f = 1/10
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