-12 - 40 = -52
-40 minus -20 is -20.
Negative 18 minus positive 12 is negative 30.
-12 minus -6 is -6
-4 minus -12 is 8.
Negative 8 minus 12 is negative 20.
-12 * * * * * Wrong! -4 minus -8 = -4 + 8 = +4
12 - 40 = -28
negative 24
12 minus -5 is 17.
-14 minus -2 is -12
-72
-12 - -36 = 24