Question 907729
{{{ (a/(a^2+3a-4))+(4a/(a^2+7a+12)) }}}


{{{ (a/((a+4)(a-1)))+(4a/(a+4)(a+3))) }}}


{{{((a(a+3))+(4a(a-1)))/(a+4)(a+3)(a-1))) }}}


{{{(a^2+3a+4a^2-4a)/(a+4)(a+3)(a-3))) }}}

{{{(5a^2-a)/(a+4)(a+3)(a-1))) }}}


{{{(a(5a-1))/(a+4)(a+3)(a-1))) }}}