|2 + ?-5 = -3||3 - ?10 = -7|
|?8 + -1 = 7||?5 - -1 = 6|
|1 - ?-2 = 3||7 - ?12 = -5|
|4 + ? + ? = ? + ? + ?-2 + -2 = -2 + -2 + -2 + 6|
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