If z1,z2 are complex numbers such that ,2z13z2 is purely imaginary number,then finds z1-z2z1+z2

If $z_{1}, z_{2}$ are complex numbers such that , $\frac{2 z_{1}}{3 z_{2}}$ is purely imaginary number,then finds $|\frac{z_{1} - z_{2}}{z_{1} + z_{2}}|$

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