# algebra

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Aaron is 13 years older than shelby. in nine years, Aaron will be twice as old as shelby. how old is shelby?

• algebra -

a = s+13
(a+9) = 2(s+9)

a - s = 13
a - 2s = 9

s = 4
a = 17
in 9 years:
s = 13
a = 26

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