Answer
Coefficeint of $x^{9}$ = -94,595,072
Work Step by Step
We know by Binomial theorem
$(x+y)^{n}$ = C(n,0)$x^{n}$ + C(n,1)$x^{n-1}$$y^{1}$ ... + C(n,n)$y^{n}$
So for coefficient of $x^{9}$ in $(2-x)^{19}$
The term will be given by C(19,10)$\times2^{10}\times$$(-x)^{9}$ = 92378$\times$1024$\times$-(1)$x^{9}$ = -94595072$x^{9}$
Coefficient of $x^{9}$ = -94,595,072