We have the following equation
180 = x + (x+30) + (4x)
180 = x + x + 30 + 4x
180= 2x + 30 + 4x
180 = 6x + 30
180 - 30 = 6x
150 = 6 x
x = 150/6
x= 50/2 (we divide the numerator and denominator by 3)
x = 25º
So the measure of the smallest angle is 25º
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