How to solve these 4 equations

Hello, I'm trying to solve these set of 4 equations and am unsure how to write them up in matlab. So far this is what I've tried with no luck:

     syms a b c d

     e1=a+d==1;

     e2=2*a+b+2*c+d==5;

     e3=2*b==2;

     e4=(d/(a+b+c+d))^2*(c/(a+b+c+d))/(a/(a+b+c+d))==exp(-2.222)/5;

     [e1,e2,e3,e4] = solve(e1, e2, e3, e4);

I am very much a beginner at Matlab for reference so am unsure how to solve this besides pressing the run key.

Answer 1

[Star Strider]

I would use the vpasolve function to get a numeric result:

[a,b,c,d] = vpasolve([e1, e2, e3, e4], [a,b,c,d]);