What concept does the image above show?

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What concept does the image above show?

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Thạch Thảo 4 years 2021-08-28T09:51:28+00:00 1 Answers 3 views 0

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  1. kimcuc
    0
    2021-08-28T09:52:36+00:00
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    there is no image??? i think you forgot it attach it

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Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )