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The sum of a number and 19 is equal to the number divided by −1728 is twelve less than 4 times a number.Find the numberDan is twice as old as Bob. The sum of their ages seven years ago was 13. How old are they nowhow many roups of 6 can you make out of 9The 원둘레 of a circle is 2𝜋 inches. What is the radius