Long addition for integers
2 answers:
-9 + 6 + (-7) +3=
-9 +6 = -3
-3 + (-7)= -10
-10 +3= -7
-4 + 9 = 5
-81 + -56 = -137
40 + 23 = 63
positive + negative (convert it to subtraction the sign changes when it depends on the higher number)
negative + negative = negative
positive + positive = positive
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