SOLUTION: (7u^4-9u-1)-(-7u^4+9u+1) =
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Question 1055487
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(7u^4-9u-1)-(-7u^4+9u+1) =
Answer by
ikleyn(53942)
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(7u^4 - 9u - 1) - (-7u^4 + 9u + 1) = 14u^4 - 18u - 2.