Answer: 144
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Step-by-step explanation:
This figure has n = 9 sides, so the interior angles sum to...
S = 180(n-2)
S = 180*(9-2)
S = 1260
This means we add up the angles listed and set the sum equal to 1260. This will let us solve for x.
x+122+128+195+145+122+144+129+131 = 1260
x+1116 = 1260
x = 1260-1116
x = 144