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f in (-oo:+oo)
1/2-f = 6*(1/3-f) // - 6*(1/3-f)
1/2-(6*(1/3-f))-f = 0
1/2-6*(1/3-f)-f = 0
(-6*2*(1/3-f))/2+(2*(-f))/2+1/2 = 0
2*(-f)-6*2*(1/3-f)+1 = 0
10*f-4+1 = 0
10*f-3 = 0
(10*f-3)/2 = 0
(10*f-3)/2 = 0 // * 2
10*f-3 = 0
10*f-3 = 0 // + 3
10*f = 3 // : 10
f = 3/10
f = 3/10
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