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Simplifying 3(u + 3) + -6u = 21 Reorder the terms: 3(3 + u) + -6u = 21 (3 * 3 + u * 3) + -6u = 21 (9 + 3u) + -6u = 21 Combine like terms: 3u + -6u = -3u 9 + -3u = 21 Solving 9 + -3u = 21 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + -3u = 21 + -9 Combine like terms: 9 + -9 = 0 0 + -3u = 21 + -9 -3u = 21 + -9 Combine like terms: 21 + -9 = 12 -3u = 12 Divide each side by '-3'. u = -4 Simplifying u = -4
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