simplify and write in the form a+bi
2 - i / 1 + 2i = (2 - i / 1 + 2i)(1 - 2i / 1 - 2i) = (2 - 4i - i + 2i^2) / (1 + 4) = (2 - 2 -4i - i) / 5 = -5i / 5 = -i
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