subtract 5x+11y-13z from the sum of 8x-6y+2z and 7x+2y-z
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sum of 2nd and 3rd equation is 15x-4y+z
and when we subtract it with 1st equation we will get 10x-7y-12z
and when we subtract it with 1st equation we will get 10x-7y-12z
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