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  1. x=-7

    Step-by-step explanation:

    The sum of the angles of a triangle are 180 degrees

    40 + x+57 + 90 =180

    Combine like terms

    187 +x = 180

    Subtract 187 from each side

    187-187 +x = 180-187

    x = -7

  2. X is 73.

    you can make an equation to find x
    [tex]3x + 2x - 61 + x - 17 = 360 \\ 3x + 2x + x = 360 + 61 + 17 \\ 6x = 438[/tex]
    [tex]x = \frac{438}{6} = 73[/tex]

    good luck

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