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f in (-oo:+oo)
7 = (1/3)*(2*f-12) // - (1/3)*(2*f-12)
7-((1/3)*(2*f-12)) = 0
(-1/3)*(2*f-12)+7 = 0
7-1/3*(2*f-12) = 0
7-1/3*(2*f-12) = 0
11-2/3*f = 0
11-2/3*f = 0
11-2/3*f = 0 // - 11
-2/3*f = -11 // : -2/3
f = -11/(-2/3)
f = 33/2
f = 33/2
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