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Simplifying u + 8u = 9u Combine like terms: u + 8u = 9u 9u = 9u Add '-9u' to each side of the equation. 9u + -9u = 9u + -9u Combine like terms: 9u + -9u = 0 0 = 9u + -9u Combine like terms: 9u + -9u = 0 0 = 0 Solving 0 = 0 Couldn't find a variable to solve for. This equation is an identity, all real numbers are solutions.
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