Question 1152031
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As written, you are requesting the reduction of {{{ d^2-(9/d^2)-7d+12 }}}

You probably wanted to ask to reduce {{{ (d^2-9)/(d^2-7d+12) }}}  (use parenthesis:  (d^2-9)/(d^2-7d+12) )


{{{ (d^2-9)/(d^2-7d+12) =  ((d-3)(d+3)) / ((d-3)(d-4))  = highlight((d+3)/(d-4)) }}}, {{{ d <> 3}}}