Hi there!
Let's start by laying out an equation and replacing "a number" with the letter "X" just to make everything clearer :
6 subtracted from 5 times X = 9
(5 × X) - 6 = 9
Now all you have to do left is solve the equation by isolating "X" :
(5 × X) - 6 = 9
Add 6 on each side of the equation
5 × X = 9
Divide each side of the equation by 5
X = 1.8
Your answer is : 6 subtracted from 5 times 1.8 is equal to 9.
There you go! I really hope this helped, if there's anything just let me know! :)