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