$\left(\theta_{, 0} + \left(\theta_{, 1} * \left(\left(\left(\left(\left(\theta_{, 2} * x_{, 5}\right) - \left(\theta_{, 3} * x_{, 1}\right)\right) * \left(\left(\theta_{, 4} * x_{, 0}\right) - \left(\theta_{, 5} * x_{, 2}\right)\right)\right) + \left(\left(\left(\left(\left(\left(\theta_{, 6} - \left(\theta_{, 7} * x_{, 3}\right)\right) * \left(\left(x_{, 3} * \theta_{, 8}\right) + \left(x_{, 5} * \theta_{, 9}\right)\right)\right) * \left(\theta_{, 10} - \left(x_{, 2} * \theta_{, 11}\right)\right)\right) + \left(\left(\left(\theta_{, 12} * x_{, 4}\right) + \left(x_{, 2} * \theta_{, 13}\right)\right) * \left(\left(x_{, 0} * \theta_{, 14}\right) - \left(x_{, 2} * \theta_{, 15}\right)\right)\right)\right) - \left(\left(\left(\left(x_{, 4} * \theta_{, 16}\right) + \theta_{, 17}\right) * \left(\left(x_{, 3} * \theta_{, 18}\right) + \left(x_{, 5} * \theta_{, 19}\right)\right)\right) * \left(\left(\theta_{, 20} * x_{, 9}\right) * \left(x_{, 2} * \theta_{, 21}\right)\right)\right)\right) - \left(x_{, 4} * \theta_{, 22}\right)\right)\right) - \left(\left(\theta_{, 23} * \left(x_{, 4} * \theta_{, 24}\right)\right) * \left(\left(x_{, 4} * \theta_{, 25}\right) - \left(x_{, 5} * \theta_{, 26}\right)\right)\right)\right)\right)\right)$