( (f-4)(f-3) - f(f+3) ) / (f+3)(f-3) = ( f^2-7f+12 - f^2 - 3f) / (f+3)(f-3)=
= (-10f+12)/(f^2-9)
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( (f-4)(f-3) - f(f+3) ) / (f+3)(f-3) = ( f^2-7f+12 - f^2 - 3f) / (f+3)(f-3)=
= (-10f+12)/(f^2-9)