|4 + ?-8 = -4||2 - ?7 = -5|
|?9 + -2 = 7||?5 - -1 = 6|
|1 - ?-3 = 4||5 - ?10 = -5|
|3 + ? + ? = ? + ? + ?-3 + -3 = -3 + -3 + -3 + 6|
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