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f in (-oo:+oo)
-12 = f/0.2 // - f/0.2
-(f/0.2)-12 = 0
-5*f-12 = 0
-5*f-12 = 0 // + 12
-5*f = 12 // : -5
f = 12/(-5)
f = -12/5
f = -12/5
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