CAN SOMEONE PLEASE JUST ANSWER THIS ASAP FOR BRAINLIEST!!!!

Answer: x - 12
Step-by-step explanation:
Area = Length * width
x² - 144 = (x + 12) * width
÷(x + 12) ÷(x + 12)
[tex]\frac{x^{2}-144} {x+12}[/tex] = width
[tex]\frac{(x-12)(x+12)} {x+12}[/tex] = width
x - 12 = width