2(7-4)+3(7-5)+8
-4(2-3-1)+2(8-5)+3(4-5)
-6+{3-[4-2(4-7)]}
8-{5-4[-6+7(5-2)]-3}
-{-6+4[2-5(4-3(4-3)+2(7-3)))]+2}-1
6-[4-3(4-2)]-{7-5[4-2(7-1)]}