Fred's age is x. Fred's age next year is x+1. Fred's age seven years ago is x-7.
The question states that his age next year x+1 is (=) twice his age seven years ago (2*(x-7).
x+1 = 2(x-7) ---> x+1 = 2x -14 ---> 15 = x.
Fred is 15. 7 years ago he was 8, and next year he is 16, which is twice as old as 8.
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