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Mathematics

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please help:( geometry, I don’t understand

Please Help Geometry I Dont Understand class=

Answer :

DATONEANDONLYGUY1IN DATONEANDONLYGUY1IN

Answer:

d = 42

Step-by-step explanation:

All angles must add up to 180 degrees because it's a line.

d + 3d + 5 + 7 = 180

4d + 12 = 180

4d = 168

d = 42

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