Mathematics
Junior High

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(2) :6 9:2=(c+7) 9, 4fot z(ツ

Answers

比例式の場合
a :b=c :dならば、ad=bcなので
9 :2=(x+7) :6だったら
9×6=54、2×(x+7)=2x+14
54=2x+14
-14+54=2x
2x=40
x=20

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