a) ( - 13) + ( - 7) = - 13 - 7 = - 20
b) 28 + ( - 19) = 28 - 19 = 9
c) ( - 17) + ( - 6) = - 17 - 6 = - 23
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a) ( - 13) + ( - 7) = - 13 - 7 = - 20
b) 28 + ( - 19) = 28 - 19 = 9
c) ( - 17) + ( - 6) = - 17 - 6 = - 23