Adding/Subtracting Integers

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1.
10 points
9 + (-20)
2.
10 points
-7 - 7
3.
10 points
-10 + (-4)
4.
10 points
-4 - (-6)
5.
10 points
8-15
6.
10 points
-6 + (-9)
7.
10 points
-12 + 16
8.
10 points
3 - (-17)
9.
10 points
-3 - (-3)
10.
10 points
9 - (-8)