Quanto é
(-1000) + ( + 800) =
( +9) + ( - 6) =
( -8 ) + ( -9 ) + ( + 1 ) + ( +2 ) =
( - 5 ) + ( + 9 ) =
( - 12) + ( + 30 ) =
( - 15) + ( -20) + ( + 25) =
(-15 ) + (-20) =
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