Write an algebraic expression that represents the surface area of a box whose width is $7y,$ the height is $5y$ and the length is $8y5.SA=2(L)(W)2(L)(H)2(W)(H),$ where L is the length, $W$ is the width, and $H$ is the height of the box. Find the dimensions of the box If the surface area is $2718m^2.$