Given :-A triangle with all sides equal .To Find :-The value of x .Solution :-As we know that angles opposite to equal angles are equal . So ultimately all the angles inside the triangle would be equal to each other . Thus the triangle is a equilateral and each angle in a equilateral triangle is 60° . So ,[tex]\sf\longrightarrow[/tex]9x - 3° = 60°[tex]\sf\longrightarrow[/tex]9x = 60° +3° [tex]\sf\longrightarrow[/tex]9x = 63°[tex]\sf\longrightarrow[/tex]x = 63°/9[tex]\sf\longrightarrow[/tex]x = 7°Hence the required answer is 7° .