In Matlab I am getting this error.. Warning: The system is rank-deficient. Solution is not unique. > In symengine In sym/privBinaryOp (line 973) In \ (line 365) In HTexam (line 18) >> This is my code:

clear, clc gen=0; x=0.005; k=386; h=40; Tinf=30; T0=100; D=0.0025; A=(3.141592*(D^2))/4; p=3.141592*D; syms T1 T2 T3 T4 T5 T6 eqns=[(k*A*(T0-T1)/x+k*A*(T2-T1)/x+h*A*(Tinf-T1)==0),... ((k*A*(T1-T2)/x+k*A*(T3-T2)/x+h*A*(Tinf-T2)==0)),... ((k*A*(T2-T3)/x+k*A*(T4-T3)/x+h*A*(Tinf-T3)==0)),... ((k*A*(T3-T4)/x+k*A*(T5-T4)/x+h*A*(Tinf-T4)==0)),... ((k*A*(T5-T6)/x+h*((p*x/2)+A)*(Tinf-T6)))]; [A,bb]=equationsToMatrix(eqns,T1,T2,T3,T4,T5,T6); z=vpa((A\bb),6);