Answer:
The operation would be marked as undefined
Explanation:
Many people don't feel comfortable using negative numbers so find the absolute values of both numbers.
|-10| = |-20| to 10 = 20
Since 10 is not equal to 20, it is undefined
-----------------------------------------------------------------------------------------------------------------
Just in case
If you meant (-10)x = (-20) Then do this:
-10x = -20
/-10 /-10 Divide by -10 do get x
A negative divided by a negative makes the answer positive.
-20/-10 = 2
x = 2