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해법
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Translate the problem into an equation:
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the 차이 of two numbers is 18 and their sum is 90 find the two numbersthree times the sum of a number and 5 is equal to 68 more than a number x is 13Father's age is 7 times as old as his son. Two years ago; father was 13 times as old as his son. What are their present ages ?A cyclist travels at an 평균 speed of 15 km per hour for 3 hours. How far has the cyclist traveled?