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a. |-18|+(-12) b. 17+|-33| c. (-20)+|-88| d. |-3|+|5| e. |-37|+|15| f. |-37|+(-|15) g. (-|-32|)+|5| h. (-|-22|)+(-|16|) k. |0|+|45|+(-|-455)|+|-796|
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