All the whole numbers $1-9$ are placed in the $9$ triangular cells. A negative sign is placed in front of some numbers. The letters $A-F$ are products of $3$ or $5$ of the numbers. Find all possible solutions.
$A= 320$
$B= 162$
$C= 6048$
$D= -60$
$E= 756$
$F= -240$
