Question 593309
multiplying by 2 ___ 2a = 1000 - (n - 1)a


distributing ___ 2a = 1000 - an + a


subtracting a ___ a = 1000 - an


adding an ___ a + an = 1000


factoring ___ a(n + 1) = 1000


dividing by n+1 ___ a = 1000 / (n + 1)