Y add -0.843 div x_1 div pow2 add -0.215 mul -16.8 x_4 div sub mul -0.8320000000000001 mul pow2 add -0.667 mul 0.428 x_2 x_2 mul -0.20700000000000002 x_3 div x_0 pow2 add -3.3000000000000003 mul -0.602 x_0