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If 2x-3i=3+6yi, determine x and y.
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By the definition, two complex numbers a + bi and c + di are equal if and only if a = c and b = d.
See the lesson Complex numbers and arithmetic operations on them in this site, or any textbook on complex numbers.
So, if 2x - 3i = 3 + 6yi, then in accordance with this definition,
2x = 3  and  -3 = 6y.
It implies that x =  and y =
 and y =  =
 =  .
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