( + 20) : ( + 2) = 20 : 2 = 10
( - 80) : ( - 10) = - 80 : ( - 10) = 8
( - 49) : ( + 7) = - 49 : 7 = - 7
( + 64) : ( - 8) = 64 : ( - 8) = - 8
( - 70) : ( - 7) = - 70 : ( - 7) = 10
( + 81) : ( - 9) = 81 : ( - 9) = - 9
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Verified answer
( + 20) : ( + 2) = 20 : 2 = 10
( - 80) : ( - 10) = - 80 : ( - 10) = 8
( - 49) : ( + 7) = - 49 : 7 = - 7
( + 64) : ( - 8) = 64 : ( - 8) = - 8
( - 70) : ( - 7) = - 70 : ( - 7) = 10
( + 81) : ( - 9) = 81 : ( - 9) = - 9