{ 1*k26*x1 + 1*k27*x2 + 1*k27*x5 = k26*k39 + k27*k40,
  1*k26*x1 + 1*k26*x3 + 1*k26*x6 + 1*k26*x7 + 1*k26*x8 = k26*k41,
  1*k26*x11 + 1*k26*x12 = k26*k42 }