The correct answer to this open question is the following.
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Which system of municipal government most symbols the federal government separation of powers?
The system of municipal government that most symbols the federal government separation of powers is the "strong mayor" mayor-council system.
In this form of government, the mayor is elected by the citizens, and its functions can be compared to the US President. Of course, on a minor scale. Regarding the Council, it plays similar roles as the US Congress or legislative branch.
The United States federal government is divided into three branches under the system of checks and balances, so none of the three could have more power than the other two.