1) 39 * 17 - 23 * 17 = 17 * (23 - (- 39))
2) 51 * (21 - 16) = 51 * 25 - 51 * 20
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1) 39 * 17 - 23 * 17 = 17 * (23 - (- 39))
2) 51 * (21 - 16) = 51 * 25 - 51 * 20