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(12 + \ / 6 ^ 2 - 4 * 5) : 2 = = (12 + \ / 36 - 20) : 2 = = (12 + \ / 16) : 2 = = (12 + 4) : 2 = = 16 : 2 = = 8.

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(12 + \ / 6 ^ 2 - 4 * 5) : 2 = = (12 + \ / 36 - 20) : 2 = = (12 + \ / 16) : 2 = = (12 + 4) : 2 = = 16 : 2 = = 8.