Question

The product of 9 and a number is 12 less than three times that number.

What is the number?

Answer 1

So let me give you the answer with procedure so that you can understand it better:
Let x = Number

Product of 9 and Number:
9x
is 12 less than 3 times that number. So:
3x - 12
Set them equal and solve for x like this:
9x = 3x - 12
6x = -12
x = -2
I hope this is very useful for you