Question 12168
{{{-5(4-(1/2)*n)+(1/16)*(-32n+8)}}}


Remove parentheses by distributive property:
{{{-5(4-(1/2)*n)+(1/16)*(-32n+8)}}}
{{{-20 + (5/2)*n + (-32n)/16 + (1/16)*8}}}
{{{-20 + (5/2)*n - 2n + 1/2}}}


Now, stop and think, 5/2 is 2 1/2, so when you take 5/2 n and take away 2n, you are left with 1/2 n.  Also, when you take -20 and add 1/2, you have -19 1/2.  So the answer should be -19 1/2 + 1/2 n.


R^2 at SCC