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The sum of all real parts is 2 + 2 + (-2) + (-2) = 0.
The sum of all imaginary parts is 3i + (-3i) + 3i + (-3i) = 0.
The resulting number (the resulting sum) is 0,
or 0 + i*0, if you want to write it in the form a + bi.
Solved, with all necessary explanations.