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In a triangle, the measure of the first angle is four times the measure of the second angle. The measure of the third angle is 84 degrees more than the second angle. What is the measure of the first angle?

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2nd angle --- x
1st angle ---- 4x
3rd angle ---- x+84

x + 4x + x+84 = 180
6x=96
x = 16

1st angle = 4x = 4(16) = 64°

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