The answer is negative four BECAUSE...
20/5 is POSITIVE four
20/-5 is a NEGATIVE four because a positive divided by a negative is a negative.
Easy way to remember negs/pos:
n * p = n
p* n = n
p * p = p
n * n = p
n / p = n
p / n = n
p / p = p
n / n = p
There are always two ways to get a positive, and two ways to get a negative. Very simple.
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