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Let $$z_1$$ and $$z_2$$ be complex numbers such that $$z_2/z_1$$ is pure imaginary and $$2z_1$$ is not equal to $$7z_2.$$ Compute $$\left | (2z_1+7z_2)/(2z_1-7z_2)\right |$$

I'd appreciate any help, and thanks in advance.

Jul 21, 2020
edited by Firebolt  Jul 21, 2020