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Simplifying -3u + 21 = -6(u + -1) Reorder the terms: 21 + -3u = -6(u + -1) Reorder the terms: 21 + -3u = -6(-1 + u) 21 + -3u = (-1 * -6 + u * -6) 21 + -3u = (6 + -6u) Solving 21 + -3u = 6 + -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 = 6 + -6u + 6u Combine like terms: -3u + 6u = 3u 21 + 3u = 6 + -6u + 6u Combine like terms: -6u + 6u = 0 21 + 3u = 6 + 0 21 + 3u = 6 Add '-21' to each side of the equation. 21 + -21 + 3u = 6 + -21 Combine like terms: 21 + -21 = 0 0 + 3u = 6 + -21 3u = 6 + -21 Combine like terms: 6 + -21 = -15 3u = -15 Divide each side by '3'. u = -5 Simplifying u = -5
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