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Don't expect a clean expression from the output of solve. Instead, print (or show) the solution by substitution and apply additional methods to simplify the expressions. In this case, you can replace the last line by
good1step4 = solve(step2[0].subs(good2step3),x1)
print("x2 =", x2.subs(good2step3).canonicalize_radical())
print("x1 =", x1.subs(good1step4).canonicalize_radical())