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12 March, 02:45

Given: Q = 7m + 3n, R = 11 - 2m, S = n + 5, and T = - m - 3n + 8.

Simplify R - [S + T].

m - 2n - 2

-m + 2n - 2

3m - 4n + 14

-3m - 4n + 14 (not this one)

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  1. 12 March, 02:54
    0
    -m + 2n - 2

    Step-by-step explanation:

    R - [S + T]

    We know R = 11 - 2m, S = n + 5, and T = - m - 3n + 8.

    Substituting these values in

    11 - 2m - [n + 5 + -m - 3n + 8]

    Combining like terms

    11 - 2m - [n + 5 + -m - 3n + 8]

    11-2m - [-2n - m+13]

    Distributing the negative sign

    11-2m + 2n + m-13

    Combine like terms

    -2 - m + 2n

    -m + 2n - 2
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