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Anonymous
27 is the answer.
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27
12 -9 + x = 3 -9 + x + 9 = 3 + 9 x = 3 + 9 x = 12
3 x 3 x 3
X + 3 = 9 x + 3 - 3 = 9 - 3 x = 6
9 x 9 x 3 = 81 x 3 = 243
9 + x = 3 x = 3-9 x = -6 Check 9 + (-6) = 3 9 - 6 = 3