Chemical Equilibrium   |POLVER05_1
f(x1) = a-((c+2*x1)^2*(a+b+c-2*x1)^2)/(x2)-x1  #
f(x2) = x2-kp*P^2*(b-3*x1)^3  #
a = 0.5   #
b = 0.8   #
c = 0.3   #
kp = 604500   #
P = 0.00243   #
x1(0)=0
x2(0)=-1