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