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A = 7. The reason it equals 7 is because 'a' is represented as a multiply number. Therefore what ever number 'A' is, it has to be multiplied by 2 (depending on what number is in front of the letter) Therefore 7 x 2 = 14. 14-15 = -1.

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Q: What does A equal if 2a-15 equals -1?
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