a) ...=10+(-7)= 10+7=17b) ...=20+(-3)= 20+3=23
c) ...= 4+(-3)= 4+3= 7
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a) ...=10+(-7)= 10+7=17
b) ...=20+(-3)= 20+3=23
c) ...= 4+(-3)= 4+3= 7