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22 December, 12:25

7z-[ (2z+y) - (-5y+3z) + 9]-12z

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  1. 22 December, 12:45
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    -4z-6y-9

    Step-by-step explanation:

    7z-[ (2z+y) - (-5y+3z) + 9]-12z

    =7z-[2z+y+5y-3z+9]-12z

    =7z-2z-y-5y+3z-9-12z

    =7z-2z-12z+3z-y-5y-9

    =-4z-6y-9
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