subtract 12x+3y-z from the sum of 7x+4y-5z and 6x-7z-8
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Step-by-step explanation:
[(7x+4y-5z) + (6x-7z-8)] - (12x+3y-z)
(13x-12z+4y-8)-(12x+3y-z)
13x-12z+4y-8-12x-3y+z
=x-11z+y-12z-8
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