First in order to divide they both have to be in fractions.
-1/5 is alredy a fraction but 20 is not. The easiest way to put it into a fraction is to put it over 1.
So now the equation is -1/5 divided by 20/1
Now in order to divide you flip the fraction after the divition sign and then multiply.
Are new equation is -1/5 times 1/20
Now solve:
-1/100
-9 divided by 7.2 you can just do long divition to solve and get the answer of -1.25
