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How do I simp (x+2)-(x-2)-12x?

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The sum of the ages of a husband and wife is 98 years. He is twice as old as she was when he was the age she is today. What are their ages? two boys on bicycles start from the same place at the same time. One rides at a rate of 12.8 km per hour and the other at 8 km per hour. They go in the same direction. In how ma