Please give the best answer you can, short but the right answer, and thank you!
60 points by the way!

Answer:
x = 4
Step-by-step explanation:
Let
Perimeter : 2( length + width)
Solve:
The perimeter is given as 42 inches
So, 12x - 6 must equal 46 inches
Solve:
[tex]\boxed{\text{x=4 inches}}[/tex]
-Chetan K