April 2019 2 58 Report
Calcules - simplifies

-a) (+ 25) + (- 12) + ( + 15 ) + ( - 23 ) =

-b) (- 17) + ( + 23 ) + (- 42 ) + (+ 39 ) + ( - 23 )

-c) 8 - 5 - 7 + 3 - 6 - 4 + 5

-d) -28 + 43 - 17 + 7 - 13 + 28
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