kill(all)$

command shift k after partial shows all option

van=facebook.com/LearningCalculus$

Log(a,u):=log(u)/log(a)$

A: matrix(
    [1,1,0],
    [0,1,1],
    [1,0,1])$

X:matrix([x, y, z]);

B:matrix([Log(3,3), Log(3,9), Log(3,27)]);

A.transpose(X) = transpose(B);

U:float(first(linsolve_by_lu(A,transpose(B))))$

transpose(X)=U;

3^(U[1]+U[2]+U[3]);