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Simplifying 3(u + 7) + -6u = -6 Reorder the terms: 3(7 + u) + -6u = -6 (7 * 3 + u * 3) + -6u = -6 (21 + 3u) + -6u = -6 Combine like terms: 3u + -6u = -3u 21 + -3u = -6 Solving 21 + -3u = -6 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. 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 = -27 -3u = -27 Divide each side by '-3'. u = 9 Simplifying u = 9
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