Y add 0.8270000000000001 div sub mul -0.978 mul sqrt add 2.49 mul 0.907 x_6 add add mul 7.07 x_1 sub mul -0.743 x_3 sub mul 19.0 x_7 mul -7.800000000000001 x_2 mul -1.9100000000000001 x_5 mul -0.267 x_0 exp add 0.767 mul -1.97 x_4