Question 1202629
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The basic equation is OBVIOUS to anybody, even without explanations

    x + (x+20) + 2x = 180  degrees.


Simplify and find x

    4x + 20 = 180

    4x = 180 - 20

    4x = 160

     x = 160/4 = 40 degrees.


<U>ANSWER</U>.  The smallest angle is 40 degrees.
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Solved.