mathematics

-9y+[7+(6y-7)]
what is the algebraic expression in simplest form?

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  1. It is either a typo or the brackets are unnecessary

    -9 y + 7 + 6 y - 7 = -3 y

  2. -9y+[7+(6y-7)]
    -9y+[7+6y-7]
    -9y+7+6y-7 = -3y.

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