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