Analytically, using beam theories, like Timoshenko or Bernoulli, maybe, see below.
Numerically, via FEM.
This is a pretty classic exam question involving a statically indeterminate (or over-constrained) system. To solve it you will need to solve the beam equations with the correct boundary conditions, which may or may not be possible (I do not recall at present whether the "cantilever and wire" has an analytical solution, I'll update this later).
Alternatively you can obtain an approximate solution by relaxing your boundary conditions, for example exchanging the cantilever for a point support with a torsional spring of suitable stiffness.
An anonymous comment pointed out that strut braced wings are almost invariably pin-jointed structures to maximise structural efficiency, the system is statically determinate. In this case the structure is analytically solvable without the need to muck around with boundary conditions and beam equations:
Reactions and internal loads for the 2D free body shown can be resolved by basic statics. The strut is a two force member, experiencing axial loads only. The inboard portion of the spar which experiences compressive loads in reacting the spanwise component of strut tensile load is usually idealised as a beam-column.