def solve_nonlinear(self, params, unknowns, resids):

        room_width = params['room_width']
        room_length = params['room_length']

        unknowns['length_minus_width'] = room_width - room_length
dataset/ETHPy150Open OpenMDAO/OpenMDAO/examples/beam_tutorial.py/LengthMinusWidth.solve_nonlinear/swapped operands of `-`