equations have relation symbols in them like =, >,< etc
so ty multiply negatives, you remember that it is the same as normal except when two different signs multiply with each other, the result is negative, when the two signs are the same, then the result is positive so
(-4)(3)(-1)(-2)
we can group them like this
[(-4)(3)][(-1)(-2)] so
[-12][2]
-24