помогите решить в emu8086. (4*a-6*b-8*c)-(a-c)

#MAKE_COM#

org 100h
mov bx, [A]
sal bx, 1
sal bx, 1
mov ax, [B]
mov dx, 6
mul dx
sub bx, ax
mov ax, [C]
mov cl, 3
sal ax, cl
sub bx, ax
sub bx, [A]
add bx, [C]
ret

A dw 15
B dw -4
C dw 11