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Step-by-step explanation:
The angles (7d+23°) and (6d) are supplementary angles,
So, 7d+23°+6d= 180°
13d+23°= 180°
13d= 180-23
d= 157/13
d= 12 1⁄13
Put value of d -->
7d + 23 = (7×12 1⁄13) + 23= 107.5384615384°
6d= 6× 12 1⁄13 = 72.46153846153°
(you may check the value using calculator)
Also angles 5d and 139° are supplementary angles,
So, 5d + 139°= 180°
5d= 180-139
d= 41/5
d= 8.2
Put value of d -->
5d= 5×8.2= 41°
Hence, the 4 angles are 107.5384615384°,72.46153846153°, 41° and 139°
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