$\"\"$

Observe the rectangle figure, the length(l) of rectangle is 12 inches, width(w) is x inches and its area(A) 54 square inches.

The area formula of rectangle is $\"\"$ .

Substitute the values of $\"\"$ in the above formula.

$\"\"$

Apply division property of equality: If $\"\"$ then $\"\"$ .

Divide each side by 12.

$\"\"$

Cancel common terms.

$\"\"$ . $\"\"$

The equation is $\"\"$ and the value of $\"\"$ .