subtract 4x-2y+z from the sum of 3x +4y and -6x+7y-8z.
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first add 3x+4y and -6x+7y-8z then you will get-3x+11y-8z then subtaract 4x -2y+z from
3x+11y-8z you will get your required answer that is x+9y-7x
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