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Simplifying 3(u + 8) + 2u = -21 Reorder the terms: 3(8 + u) + 2u = -21 (8 * 3 + u * 3) + 2u = -21 (24 + 3u) + 2u = -21 Combine like terms: 3u + 2u = 5u 24 + 5u = -21 Solving 24 + 5u = -21 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-24' to each side of the equation. 24 + -24 + 5u = -21 + -24 Combine like terms: 24 + -24 = 0 0 + 5u = -21 + -24 5u = -21 + -24 Combine like terms: -21 + -24 = -45 5u = -45 Divide each side by '5'. u = -9 Simplifying u = -9
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