(6-x)/2=4
 x2 x2 multiply both sides by 2
 6-x=8
-6 -6 subtract 6 on both sides
 -x=2
 /-x /-x divide by -x to get positive x
 x=-2
--or--
6-(x/2)=4
-6 -6 subtract 6 on both sides
 -x/2=-2
 x2 x2 multiply 2 on both sides
 -x =-4
 /-x /-x divide by -x to get positive x
 x =4