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f in (-oo:+oo)
1/2 = f/8+1/4 // - f/8+1/4
1/2-(f/8)-(1/4) = 0
1/2-(f/8)-1/4 = 0
1/4-1/8*f = 0 // - 1/4
-1/8*f = -1/4 // : -1/8
f = -1/4/(-1/8)
f = 2
f = 2
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