Answer:
x = 30
Explanation:
You want the value of x given that adjacent angles in a parallelogram are (3x+30)° and (2x)°.
Supplementary angles
Adjacent angles in a parallelogram total 180°, so ...
(3x +30)° +2x° = 180°
5x +30 = 180 . . . . . . . . . divide by °, simplify
x +6 = 36 . . . . . . . . . divide by 5
x = 30 . . . . . . . . . subtract 6
The value of x is 30.
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Additional comment
The angles are (3·30 +30)° = 120°, and 2·30° = 60°.