Question 716428
{{{drawing(300,200,-1.2,13.2,-8,8,
red(rectangle(0,4,5,6)),locate(2.4,5.5,red(5)),
red(rectangle(0,0,5,2)),locate(2.4,1.5,red(5)),
blue(rectangle(5,0,12,2)),locate(8.4,1.5,blue(7)),
red(rectangle(0,-6,5,-4)),locate(2.4,-4.5,red(5)),
blue(rectangle(5,-6,12,-4)),locate(8.4,-4.5,blue(7)),
green(rectangle(9,-6,12,-4)),locate(10.4,-4.5,green(3)),
arrow(5,-1,0,-1),arrow(7,-1,12,-1),locate(5.5,-0.3,12),
arrow(6.5,-3.5,5,-3.5),arrow(7.5,-3.5,9,-3.5),locate(6.9,-2.7,4),
arrow(4,-7,0,-7),arrow(5,-7,9,-7),locate(4.3,-6.3,9)
)}}} {{{5+(7-3)=5+4=9}}} or {{{5+7-3=12-3=9}}}