Answer:Perhaps you made a typo because there is no solution to this problem.
Explanation:
We know one of the numbers is negative and one is positive since when multiplied the output is negative. And the negative number will be the smaller of the two since the sun is positive. So the factors of -20 are:
-1•20 -1+20=19
-2•10 -2+10=8
-4•5 -4+5=1
None of those equal 6 so i apologise but it seems this equation has no answer.