Question 948761
 the number halfway between the given numbers: 


{{{((-5/39) +(-6/117))/2}}}


={{{(-5/39 -6/117)/2}}}

={{{(-((5*3)/(39*3) -6/117))/2}}}

={{{((-15/117 -6/117))/2}}}

={{{(-(15 +6)/117)/2}}}

={{{(-21/117)/2}}}

={{{-21/(117*2)}}}

={{{-21/234}}}

={{{-7/78}}}-> answer