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Simplifying 3u + 21 = 6u Reorder the terms: 21 + 3u = 6u Solving 21 + 3u = 6u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-6u' to each side of the equation. 21 + 3u + -6u = 6u + -6u Combine like terms: 3u + -6u = -3u 21 + -3u = 6u + -6u Combine like terms: 6u + -6u = 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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