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Simplifying 21 = 3u + -9 Reorder the terms: 21 = -9 + 3u Solving 21 = -9 + 3u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-3u' to each side of the equation. 21 + -3u = -9 + 3u + -3u Combine like terms: 3u + -3u = 0 21 + -3u = -9 + 0 21 + -3u = -9 Add '-21' to each side of the equation. 21 + -21 + -3u = -9 + -21 Combine like terms: 21 + -21 = 0 0 + -3u = -9 + -21 -3u = -9 + -21 Combine like terms: -9 + -21 = -30 -3u = -30 Divide each side by '-3'. u = 10 Simplifying u = 10
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