Aircraft Performance Question -- Berguet

[LaReina]

Homework Statement

What cruise velocity should the aircraft fly to maximize the cruise range?
Aircraft mass (excluding fuel), m0= 14000kg
Mass of fuel, mf = 2500kg
Specific fuel consumption of aircraft engine, sfc = 2.8$\times$10-5 kg/N/s
Drag polar, CD = 0.02+0.08CL^2
Planform area of aircraft wings, S = 65m2

Homework Equations

Breguet Equation
Coefficient of Lift

The Attempt at a Solution

I am trying to find the coefficient of lift but there has been no given velocity. I then try to find the velocity but there is no given coefficient of lift. I feel like I'm going around in circles.
Cl=2L/ρV²S
L=W (14000+2500)$\times$9.81=161865N

 

[Simon Bridge]

Are you not assuming uniform level flight?
Does that not make the lift equation rather simple?

How about showing the details of the working, with reasoning, that you have already.