|2 + ?-6 = -4||3 - ?8 = -5|
|?9 + -3 = 6||?5 - -1 = 6|
|1 - ?-1 = 2||6 - ?13 = -7|
|3 + ? + ? = ? + ? + ?-3 + -3 = -3 + -3 + -3 + 6|
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