20 + 2 - 22, 10 + 7 - 17, 40 + 3 - 43, 10+10= - 20, 10 + 10 + 10 - 30, 20 + 9 - 29, 50 + 1 = - 51, 60 + 6 - 66, 80 + 4 - 84, 30+30= - 60, 5+5= - 10, 10+3= - 13,

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