{ 1*k33*x1 + 1*k33*x2 + 1*k33*x3 + 1*k33*x4 + 1*k33*x5 = k33*k35,
  1*k33*x7 + 1*k33*x8 = k33*k36,
  1*k33*x9 + 1*k33*x10 + 1*k34*x11 = k33*k37 + k34*k38 }