7(4 - x)=9( x - 4 )和6(3x - 2) - 4(4x - 3 )=1方程怎么解还有几道题问大家全部答对的我加悬赏 1.一袋白面每袋50元,连续两次减价10%后,售价应为( )元.2.父亲比儿子大30岁,明年儿子的年龄恰好是父

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