Sum of inner angles: 540°
m
100 + 83 + (x-9) + (x-3) + x = 540
Solve for x
100 + 83 -9 - 3 + x +x +x = 540
171 + 3x = 540
3x= 540 -171
3x= 369
x= 369/3
x= 123
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