



 
Sean, You are given the equations
Since you have more unknowns than equations you are not going t obtain a unique solution. My first action was to rearrange the two equations to obtain
and then add the equations to get
or
If you substitute this back into the two given equations they both simplify to the same equation
or
Hence you can give Fab any value and obtain a solution with that value for Fab and Fbd and Fbc determined by the highlighted equations. Harley  


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