Answer:
DE = 12
Explanation:
DF = DE + EF
7x = x+9 + 9
7x = x + 18
6x = 18
x = 3
DE = 3 + 9
Answer: 12
x + 9 + 9 = 7x
9 + 9 = 6x
18 = 6x
DE = x + 9 = 3 + 9 = 12 :>
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