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Simplifying 6 = 21 + -3u Solving 6 = 21 + -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. 6 + 3u = 21 + -3u + 3u Combine like terms: -3u + 3u = 0 6 + 3u = 21 + 0 6 + 3u = 21 Add '-6' to each side of the equation. 6 + -6 + 3u = 21 + -6 Combine like terms: 6 + -6 = 0 0 + 3u = 21 + -6 3u = 21 + -6 Combine like terms: 21 + -6 = 15 3u = 15 Divide each side by '3'. u = 5 Simplifying u = 5
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