해법
해법
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Twice a number plus 4 is-54 . Find the number.The sum of a number and 8 is 20. Find the numberTwo less than the product of 9 and a number is 7.A dog groomer charges 39.50. The dog’s owner wants to give a 15% tip. What would be the total cost including the tip? Round to the nearest cent.What is the 반지름 of a sphere with a volume of 320 ft^3