when the Danés multiplied their secret number by 3 and then added -7, the result was 72 less than twice the opposite of the number. what was the secret number
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3x - 7 = 2*(-x) - 72
3x - 7 = -2x - 72
3x + 2x = -72 + 7
5x = -65 = -13.
Answer. -13.
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