Question: conjugate can not be substituted or replaced, how to subs it

with(Physics):

u := subs(x3=x3(t),subs(x2=x2(t),subs(x1=x1(t),u)));u := -Physics[`*`](Physics[`*`](Physics[`*`](3, Physics[`^`](conjugate(x2(t)), 2)), x2(t))+Physics[`^`](x1(t), 2)-x3(t), Physics[`^`](1+Physics[`*`](3, Physics[`^`](conjugate(x2(t)), 2)), -1));

u = subs(conjugate(x3(t))=x3(t),subs(conjugate(x2(t))=x2(t),subs(conjugate(x1(t))=x1(t),u)));

would like to remove all conjugate back to normal variable

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