3(2n-4)+6n
Distribute the 3! ^^
(6n-12)+6n
Remove parenthesis! ^^
6n-12+6n
Add the available ones (w/ and without variables)! ^^
12n-12
Okay...isolate the variable! ^^
*12n = 12*
Simplify! ^^
n = 1
The answer is A: 12n-12. Why? Because this appeared during my process (step 3).