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Simplifying 10u + -21 = u Reorder the terms: -21 + 10u = u Solving -21 + 10u = u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-1u' to each side of the equation. -21 + 10u + -1u = u + -1u Combine like terms: 10u + -1u = 9u -21 + 9u = u + -1u Combine like terms: u + -1u = 0 -21 + 9u = 0 Add '21' to each side of the equation. -21 + 21 + 9u = 0 + 21 Combine like terms: -21 + 21 = 0 0 + 9u = 0 + 21 9u = 0 + 21 Combine like terms: 0 + 21 = 21 9u = 21 Divide each side by '9'. u = 2.333333333 Simplifying u = 2.333333333
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