-(1/3)(-6y)(3x)(-3)(-1)=
Well, if you are multiplying 2 numbers together
If both numbers have the same sign, both positive, or both negative, then the sign of the answer will be positive
If one of the numbers is positive and the other is negative, then the sign of the answer will be negative.
From this you should be able to work out if the answer is positive or negative
now it is just
(sign that you have worked out) 1/3 *6 * 3 * 3 * 1
1/3 of 6 is 2
Can you do the rest?
+118654 
