15 = 2m - 7
15 + 7 = 2m - 7 + 7
22 = 2m
22/2 = 2m/2
m = 11 years old
15 = 2m - 7
15 + 7 = 2m - 7 + 7
22 = 2m
22/2 = 2m/2
m = 11 years old
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