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please help me <33 I don’t understand

Please Help Me Lt33 I Dont Understand class=

Sagot :

Answer:

d = 42

Step-by-step explanation:

since you have two angles which add up to a straight line, you know that they must equal 180°

simply

180 = (d + 7) + (3d + 5)

180 = 4d + 12

d = 42

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