Question

12+4n Over 3= 8 What is n?

Answer 1

There are two different ways we can read your question.
Each way has a different answer.
Here it is both ways:

Way #1:                         (12 + 4n) / 3 = 8

Multiply each side by  3 :      12 + 4n = 24
Subtract 12 from each side:          4n = 12
Divide each side by 4:                     n =  3 .

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Way #2:                        12 + 4n/3 = 8

Subtract 12 from each side:  4n/3 = -4
Multiply each side by 3:         4n   = -12
Divide each side by 4:              n  = - 3

Answer 2

Means 12+4n=8*3
12+4n=24
If you subtract 12 to both sides you get
4n=12
n=12/4
n=3