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1 is the number you are looking for.1 + 12 = 1 + 1 = 2.QED
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1-2 equals -1. 2-3 equals -1. -1 plus -1 equals -2. as in all mixed sign problems, the answer to each part of the problem takes on the sign of the larger number.
To find a number divided by 2 that equals 0.5, you would need to use the inverse operation of division, which is multiplication. Therefore, the number you are looking for is 0.5 multiplied by 2, which equals 1. So, the answer is 1.
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