Diode \({D}_{1} \& {D}_{2}\) are in forward bias i.e. \({R}=30 \,\Omega\)

whereas diode \({D}_{3}\) is in reverse bias i.e. \({R}=\) infinite

\(\Rightarrow\) Equivalent circuit will be

Applying \(KVL\) starting from point \(A\)

\(-\left(\frac{{I}_{1}}{2}\right) \times 30-\left(\frac{{I}_{1}}{2}\right) \times 130-{I}_{1} \times 20+200=0\)

\(\Rightarrow-100 {I}_{1}+200=0\)

\({I}_{1}=2\)