(+10) + (-4) =
-21
+2
+6
is (-12) + ( +7) = -13
(- 14) + ( - 3) =
-17
-12
+5
(- 13) + ( + 21)= +8
(-11) - (+ 16) = (+5) - (+34) =
-27,-24
-27,-2
-27,-29
(- 25) - (- 16) = (- 18) - (- 39) =
-9,+15
-9,+21
-8,+21