Find the Measure Of $\angle 3$ In the Figure Given That Line

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Find the measure of $\angle 3$ in the figure given that line $\ell _ { 1 }$ is parallel to line $\ell _ { 2 }$ and $$m \angle 5 = 120 ^ { \circ }$$ $m \angle 3 =$ __________ ${ \circ }$