Question 1066885
You start by bringing both rational expressions to the same denominator.


{{{ ((x-3) /( x+4))((x-4)/(x-4)) }}} - {{{ ((x+6)/ (x-4))((x+4)/(x+4)) }}}



Either of these should be good:


{{{system((17x+12)/(16-x^2),or,(17x+12)/((4-x)(4+x)))}}}