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Douglas Powlowski ∙
10 - (-7) = 17
7 - 10 = -3
10 minus -7 is the same as 10+7. So, 10--7=17.
-7 minus -10 is 3
-10 minus 7 is -17
-7 - 10 = -17
-3
9/10 minus 7/8 is 1/40
10 to the minus 7 power (10^-7)
-7 plus 10 is the same as 10 minus 7, which is 3.