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Simplifying 3(u + 3) + -8u = -21 Reorder the terms: 3(3 + u) + -8u = -21 (3 * 3 + u * 3) + -8u = -21 (9 + 3u) + -8u = -21 Combine like terms: 3u + -8u = -5u 9 + -5u = -21 Solving 9 + -5u = -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 + -5u = -21 + -9 Combine like terms: 9 + -9 = 0 0 + -5u = -21 + -9 -5u = -21 + -9 Combine like terms: -21 + -9 = -30 -5u = -30 Divide each side by '-5'. u = 6 Simplifying u = 6
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