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You know that molecules like ammonia (NH3) have a zero charge and compounds like cyanide (CN-) have charges on them. Add the charge of the compound/molecule to the oxidation state of the anion (i.e. -1 for Cl). Then, you look at the overall charge of the coordinate compound to figure out the oxidation state of the metal. For example, if the sum of the molecule and anion charges is -2 and the overall charge on the coordination compound is 0, then the metal has a charge of +2.
There are also tables you can look at online that can give you a general idea of what to expect the charges of the elements to be. For example, you can look at trends in ionic charge and it shows that for elements in the left side of the periodic table charges will be positive and for the right side charges are mostly negative and that in transition metals it can vary.
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