Solve for a
a=a_{15}-14d
Solve for a_15
a_{15}=a+14d
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a_{15}=a+14d
Subtract 1 from 15 to get 14.
a+14d=a_{15}
Swap sides so that all variable terms are on the left hand side.
a=a_{15}-14d
Subtract 14d from both sides.
a_{15}=a+14d
Subtract 1 from 15 to get 14.
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