Question 881300
If you mean the factor 2 on the left side, then simply use distributive property and what you already know.


{{{2x+2iy=5+4i}}}
{{{2x+2yi=5+4i}}}
Compare corresponding components.
-
{{{2x=5}}}
{{{highlight(x=5/2)}}}
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{{{2yi=4i}}}
{{{2y=4}}}
{{{highlight(y=2)}}}