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Let 3 i 3 1 2 ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ − − = 27 iy x + (i = 1 − ), where x and y are real numbers, then y – x equals :

1. –85
2. 85
3. –91
4. 91

Correct answer: 91

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