The angles of a triangle are x, x+15 and 2x- 15 degree.Find the smallest angle of the triangle

 measures of all angles  of triangle is 180
x + x + 15 + 2x - 15 = 180
4x = 180
x = 45
first angle = 45 degree
second angle = 60 degree
third angle = 75 degree 
smallest angle = 45 degree

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