If Jim is x years old now, and his sister is twice as old, how old was his sister 7 years ago?
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Sum of a number, x and 4 all divided by 3
sum of x and 4 means x+4
all divided by 3
evaluate for x=5
it's 3
sum of x and 4 means x+4
all divided by 3
evaluate for x=5
it's 3