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Simplifying 21 + -2u = u Solving 21 + -2u = 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 + -2u + -1u = u + -1u Combine like terms: -2u + -1u = -3u 21 + -3u = u + -1u Combine like terms: u + -1u = 0 21 + -3u = 0 Add '-21' to each side of the equation. 21 + -21 + -3u = 0 + -21 Combine like terms: 21 + -21 = 0 0 + -3u = 0 + -21 -3u = 0 + -21 Combine like terms: 0 + -21 = -21 -3u = -21 Divide each side by '-3'. u = 7 Simplifying u = 7
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