-80-5+1+70+9-4=
+32+28+1-25-24-2=
+28-46+20-4+10-2=
-15-25-2+19+11+8=
+10-(3x2)+15-20=
+12+(8/2)-6+3-(20/4)-8=
-1
-9
+6
-4
+10
0
