Solving for two unknown variables

[JMCB23]

As I'm new to Octave and haven't used matlab in about 3 years, I'm just
having a bit of trouble trying to solve for two unknowns simultaneously: 

>> aa = 0.3;
>> S0 = 342.5;
>> ta = 0.53;
>> oo = 5.67e-8;
>> as = 0.11;
>> taa = 0.06;
>> aaa = 0.31;
>> c = 2.7;

(aa*S0)+(ta*S0)+(2*oo*Ta^4)+(taa*oo*Ts^4)+(aaa*oo*Ts^4)=(S0)+(as*ta*S0)+(c*(Ts-Ta)+oo)*(Ts^4)

As shown in the equation above, the two values I'm trying to find are that
of Ta and Ts, however I'm not sure what function or coding to solve this
equation. If anyone could assist me with this, that would be great. Thanks!




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