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f in (-oo:+oo)
-12 = f/2+8 // - f/2+8
-(f/2)-12-8 = 0
-1/2*f-20 = 0 // + 20
-1/2*f = 20 // : -1/2
f = 20/(-1/2)
f = -40
f = -40
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