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f in (-oo:+oo)
-2/3 = (1/1)/2-f/6 // - (1/1)/2-f/6
-(-f/6)-2/3-((1/1)/2) = 0
(1/6)*f-2/3-1/2 = 0
1/6*f-7/6 = 0 // + 7/6
1/6*f = 7/6 // : 1/6
f = 7/6/1/6
f = 7
f = 7
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