find x in this figure
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45° + ( 3x +16 )° + 68° = 180° ( Angle sum property of triangle)
45° + 3x + 16° + 68° = 180°
45° + 16° + 68° + 3x = 180°
129° + 3x = 180°
3x = 180° - 129°
3x = 51°
I hope it will help you
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