subtract 2x + Y - Z from the sum of 9x -7 + 8z and -8x + 9y -7 z
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here is the answer in the picture
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firstly, we have to find the sum of (9x-7+8z) and (-8x+9y-7z)
(9x-7+8z)+(-8x+9y-7z)
9x-7+8z-8x+9y-7z
combine like terms,
9x-8x+8z-7z+9y-7
x+z+9y-7
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May be it helps you.
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