Ralph is 3 times as old as Sara. In 6 years, Ralph will be only twice as old as Sara will be then. Find Ralph's age now.
Which of the following equations could be used to solve the problem?
x + 6 = 2 (3 x + 6)
3 x + 6 = 2 x + 6
3 x + 2 x
3 x + 6 = 2 (x + 6)
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