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Let x equal the first angle.
let 4x= the second angle
let 3x+10
x+4x+3x+10=180 The sum of the interior angle measures of a triangle is 180 degrees.
8x+10=180 combine like terms
8x=170 addition(subtraction) property of equality
x=21.25 degrees

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Q: The second angle of a triangle is four times as large as the first The third angle is 10 degrees more than three times the first angle Find the measure of the first angle?
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