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Simplifying 3(u + 7) = -9u + -15 Reorder the terms: 3(7 + u) = -9u + -15 (7 * 3 + u * 3) = -9u + -15 (21 + 3u) = -9u + -15 Reorder the terms: 21 + 3u = -15 + -9u Solving 21 + 3u = -15 + -9u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '9u' to each side of the equation. 21 + 3u + 9u = -15 + -9u + 9u Combine like terms: 3u + 9u = 12u 21 + 12u = -15 + -9u + 9u Combine like terms: -9u + 9u = 0 21 + 12u = -15 + 0 21 + 12u = -15 Add '-21' to each side of the equation. 21 + -21 + 12u = -15 + -21 Combine like terms: 21 + -21 = 0 0 + 12u = -15 + -21 12u = -15 + -21 Combine like terms: -15 + -21 = -36 12u = -36 Divide each side by '12'. u = -3 Simplifying u = -3
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