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f in (-oo:+oo)
-2/3 = 3/2-f/6 // - 3/2-f/6
-(-f/6)-2/3-(3/2) = 0
(1/6)*f-2/3-3/2 = 0
1/6*f-13/6 = 0 // + 13/6
1/6*f = 13/6 // : 1/6
f = 13/6/1/6
f = 13
f = 13
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