RESTA ARITMETICA
7 - ( + 2 ) =5
7 + ( - 2 ) =5
9 - (- 3 ) =12
( - 9 ) + ( + 3 ) =−6
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RESTA ARITMETICA
7 - ( + 2 ) =5
7 + ( - 2 ) =5
9 - (- 3 ) =12
( - 9 ) + ( + 3 ) =−6