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let, the angle of triangle be ABC
So, angle C=>180°-139°=41°
{ •°• we know that sum of angle of triangle=180°}
A + B + C=180°
=>x° + 104° + 41° = 180
=>x°+145°=180°
=>x=180°-145°
=>x=35°
Hence, x= 35°
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