Y add 26.0 sub sub mul -0.843 div div sub sub mul 0.855 x_1 sub mul 5.04 x_2 mul -3.0500000000000003 x_3 mul 7.0600000000000005 x_3 x_2 x_4 mul -68.10000000000001 mul x_2 x_0 mul 87.2 sqrt add 0.779 mul -0.17 x_2