Since b = x, hence the value of b is 30 degrees
For two angles to be supplementary, the sum of the angles must be equal to 180 degrees
Given the angles
a = 30 + 2x
b = x
Equating the sum to 180
a + b = 180
30+2x + x = 180
30 + 3x = 180
3x = 180 - 30
3x = 150
x = 30 degrees
Since b = x, hence the value of b is 30 degrees
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