To find what n is equal to, you have to isolate it. But because 6 and n are being multiplied together (that is what is assumed whenever a number and a variable are right next to each other), you have to divide by 6. But dividing only 6n by 6 would make the equation uneven.
So, divide BOTH sides by 6.
6n/6=84/6
n=14
The correct answer is the second choice, B. n=14.