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S=n/2 [a+(n-1)d]
make a subject​

User Anj
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s = \frac n 2 (a + (n-1) d)


(2s)/(n) = a + (n-1)d


(2s)/(n) -(n+1)d = a

We could expand this further but let's call it done.

Answer: a = 2s/n - (n+1)d

User Xordon
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