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f in (-oo:+oo)
f/6 = 25/4 // - 25/4
f/6-(25/4) = 0
f/6-25/4 = 0
1/6*f-25/4 = 0 // + 25/4
1/6*f = 25/4 // : 1/6
f = 25/4/1/6
f = 75/2
f = 75/2
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