Answer is 3 ( 1 -2x )
Step by step
3 - 6x is your expression
You want to factor out any number or variable that can be divided into any number or variable in the term
3 is divisible by 3 and 6 is divisible by 3 so 3 goes outside the parentheses
x is NOT divisible in 3 although it is in 6x
It has to work with every part of the term so x cannot be factored out
3 ( )
Now divide the two parts of your term by 3 and put your answer in the parentheses
3/3 - 6x/3
3 ( 1 - 2x )
You can check your work by distribution
3 ( 1 - 2x )
3 - 6x
This was your original expression! Problem solved