16
-19 and -20
-20 -(-5) = -15 ie -(-5) = +5 therefore -20 +5 =15 (two double minuses = a positive)
9 - - 6 + 20 = 35
-28
a= -4 because a negative times a negative equals a positive
Negative 15 plus positive 20 equals 20 minus 15, which equals 5.
16
y equals negative 8.
-19 and -20
-20 -(-5) = -15 ie -(-5) = +5 therefore -20 +5 =15 (two double minuses = a positive)
9 - - 6 + 20 = 35
x = -20
-28
10 minus negative 10 equals 20: 10 - (-10) = 20 or rather 10 + 10 = 20. 10- (minus 10) = 20
The problem 20 minus negative 24 equals 44 because two negatives become a positive.
Your question is not very clear. Are you asking: solve for x where negative 4 over x equals negative 20. x equals 1/5 (one fifth)