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OpenStudy (anonymous):
(5x - 7y + 8z) - (-2x + 3y -z)
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OpenStudy (callisto):
(5x - 7y + 8z) - (-2x + 3y -z) = 5x - 7y + 8z + 2x - 3y +z = 5x + 2x -7y -3y +8z + z = combine the like terms and get the answer!
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