The perimeter of a Rectangle.
[tex]\begin{gathered} Perimeter\text{ of a rectangle = 2(L+}B) \\ \text{ P = 2\lbrack(5x+3)}+(4x-6)\rbrack \\ P=2(5x+3+4x-6) \\ P=\text{ 2(5x+4x+3-6)} \\ P=2(9x-3) \\ P=18x-6 \end{gathered}[/tex]The correct expression for the required perimeter is 18x - 6
