# Chapter 2 - Section 2.3 - Proving Lines Parallel - Exercises - Page 88: 25

x=120$^{\circ}$

#### Work Step by Step

Angles 3 and 5 are same side interior angles so they are supplementary. m$\angle$3+m$\angle$5=180 $\frac{x}{2}$+x=180 x+2x=360 3x=360 x=120

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