Question 1073361
The expansion of {{{(x-1/2x^5)^18=(x+(-1/2)x^(-5))^18}}}
has terms of the form
{{{(matrix(2,1,18,n))x^(18-n)(x^(-5))^n=(matrix(2,1,18,n))x^(18-n)x^(-5n)=(matrix(2,1,18,n))x^(18-6n)}}} .
The term independent of x is the one with
{{{18-6n=0}}}<-->{{{18=6n}}}<-->{{{18/6=n}}}<-->{{{n=3}}}
So, that term independent of x is
{{{(matrix(2,1,18,n))=18*17*16/(2*3)=highlight(816)}}}