solve T = 20 + 273.15, P = 101350 * exp((6999.123 * (0.00267989 - (1 / T)) - 5.713172 * ln(T / 373.15)) + 1.511 * 10^-9 * T^3 + 3.001 * 10^-6 * T^2 - 0.002142 * T + 0.3033) for P