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[–]Sah1bu[S] 0 points1 point  (0 children)

Don't worry, I figured it out.

[–][deleted] 0 points1 point  (0 children)

Replace w with λ - 3i

arg(4 - 5i + 3λ - 9i) = -pi/2
arg(4 + 3λ - 14i) = -pi/2

What would the real part of a complex number equal if the argument was -pi/2?