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f in (-oo:+oo)
(1/6)*f = -1/4 // + -1/4
(1/6)*f-(-1/4) = 0
(1/6)*f+1/4 = 0
1/6*f+1/4 = 0 // - 1/4
1/6*f = -1/4 // : 1/6
f = -1/4/1/6
f = -3/2
f = -3/2
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