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f in (-oo:+oo)
(1/3)*f^2-((7/6)*f)+1/2 = 0
(1/3)*f^2+(-7/6)*f+1/2 = 0
1/3*f^2-7/6*f+1/2 = 0
DELTA = (-7/6)^2-(1/3*1/2*4)
DELTA = 25/36
DELTA > 0
f = ((25/36)^(1/2)+7/6)/(1/3*2) or f = (7/6-(25/36)^(1/2))/(1/3*2)
f = 3 or f = 1/2
f in { 1/2, 3 }
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