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Nguyễn Huy Hoàng

27/08/2017 at 08:49
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   x+10-20=70-10

  x-20+40=40+20



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    Dao Trong Luan 27/08/2017 at 09:00

    x + 10 - 20 = 70 - 10

    => x + 10 = 70 - 10 + 20

    => x + 10 = 80

    => x = 70

    x - 20 + 40 = 40 + 20

    => x - 20 = 40 + 20 - 40

    => x - 20 = 20

    => x = 40

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