Mathematics
Junior High

求め方と答え教えて欲しいです

(6) 9 Gj B 4.5 D -14- A E F

Answers

△DBFと△GBCは相似。
よって、三角形の比を使って、
9-x:x=14:7
14x=63-7x
21x=63
x=21

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