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f in (-oo:+oo)
(1/8)*f = 3/16 // - 3/16
(1/8)*f-(3/16) = 0
(1/8)*f-3/16 = 0
1/8*f-3/16 = 0 // + 3/16
1/8*f = 3/16 // : 1/8
f = 3/16/1/8
f = 3/2
f = 3/2
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