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6. Angle measurements:
x = 23
51 degrees
80 degrees
(2x + 3) = 49 degrees

8.
x = 30 degrees
3x = 90 degrees
2x = 60 degrees
x = 30 degrees

9.
x = 29 degrees
90 degrees
(2x - 2) = 56 degrees
(x + 5) = 34 degrees