Question 329408
Let {{{E}}} be Erin's age right now.
In {{{7}}} years, she'll be {{{E+7}}}
Eight years ago she was {{{E-8}}}
{{{E+7=2(E-8)}}}
{{{E+7=2E-16}}}
{{{E=23}}}
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In 7 years, she'll be 30.
Eight years ago she was 15. 15(2)=30.
Verified.