The sum of the ages of Doris and Fred is y years. If Doris is 12 years older than Fred, how many years old will Fred be y years from now, in terms of y?
y-6
2y-6
~$\frac{y}{2}$~-6
~$\frac{3y}{2}$~-6
~$\frac{5y}{2}$~-6
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d+f=y d-f=12 f+y=?
d+f=y
d-f=12
f+y=?
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