Question 1179538
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<pre>
The alternate interior angles, formed by two parallel lines and a transverse line, 
are congruent and have the same measure.


So, we write

    2x = x + 30


and obtain immediately from this equation

    2x - x = 30,

       x   = 30  degrees.    <<<---===  <U>ANSWER</U>
</pre>

Solved.