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Norton theorem,max. power transfer

How should I calculate the max. power transfer to Xload?
The (20+30j) of Xload,it is not necessary.

I try to find the answer,but why I got two answers by different methods?

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Given the problem statement it would be possible to calculate the power dissipated in the load; however, to calculate the point of maximum power transfer one or more component values would need to be varied over a range until the point of maximum power transfer was achieved. But none of the components in the circuit are shown as variable! This problem does not make sense.
 
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