Math
posted by ASDFGHJKL; .
S = n/2 (a+1)
The subject of the formula is L
Same as before, please include workings TYVM

There is no L in your formula.
You seem to be confusing 1, l and L.
You still need to know how to use parentheses to avoid ambiguity in typed equations. 
Oh sorry yes that's what i mean:
S = (n/2)*(a+L) 
S = (n/2)*(a+L)
S/(n/2) = a + L
2*S / n = a + L
(2*S / n)  a = L , or
L = (2*S / n)  a
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