100 - 110 = -10.
100 minus 110 is -10.
-10 minus -10 is 0.
-10 minus -28 is 18.
10 minus -20 is 30.
negative 10 -10
-33 minus -23 is -10.
-6/10 minus -7/10 is 1/10
-10 minus 7 is -17
-4 - 6 - (-10) = 0
negative 4
10 minus -7 is the same as 10+7. So, 10--7=17.