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パソコンの仕入れ値をx円とする
仕入れ値 ･･･x
定価 ･･･x+3x/10=13x/10
値引き価格･･･13x/10-20000
13x/10-20000=21x/20
26x =21x+400000
5x =400000
x =80000
眠いので、間違ってたらすみません💦
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