Answer:
[tex]x=39\textdegree[/tex]
Step-by-step explanation:
[tex]Sum\ of\ angles\ in\ a\ triangle=180\textdegree\\\\Given,\\\\First\ angle=x\textdegree\\\\Second\ angle=39\textdegree\\\\Third\ angle=102\textdegree\\\\First\ angle + Second\ angle+ Third\ angle=180\textdegree\\\\x+39+102=180\\\\x+141=180\\\\x=180-141\\\\x=39\textdegree[/tex]
