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f in (-oo:+oo)
-12 = f/12+8 // - f/12+8
-(f/12)-12-8 = 0
-1/12*f-20 = 0 // + 20
-1/12*f = 20 // : -1/12
f = 20/(-1/12)
f = -240
f = -240
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