n would equal 2.5 because if 6n = 15 then you would divide 6 from both sides leaving n= 15/6 and then n=2.5 (^-^)
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6 x n = 90 n = 15
-24
15+2*n = 9 2*n = -6 n = -3
t(n) = (n+1)*(n+2)/2 where n = 1 ,2, 3, ...
x+15/n * * * * * No. It is n/15