Y add -0.591 sub mul 0.493 x_1 mul -7.68 div mul mul mul x_2 sub mul 5.1000000000000005 x_2 mul 6.2700000000000005 x_4 div sub mul 43.400000000000006 x_3 mul 0.268 x_3 x_0 exp add 0.656 mul -93.5 x_2 x_4