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Simplifying 21 = 3(u + 3) + -8u Reorder the terms: 21 = 3(3 + u) + -8u 21 = (3 * 3 + u * 3) + -8u 21 = (9 + 3u) + -8u Combine like terms: 3u + -8u = -5u 21 = 9 + -5u Solving 21 = 9 + -5u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '5u' to each side of the equation. 21 + 5u = 9 + -5u + 5u Combine like terms: -5u + 5u = 0 21 + 5u = 9 + 0 21 + 5u = 9 Add '-21' to each side of the equation. 21 + -21 + 5u = 9 + -21 Combine like terms: 21 + -21 = 0 0 + 5u = 9 + -21 5u = 9 + -21 Combine like terms: 9 + -21 = -12 5u = -12 Divide each side by '5'. u = -2.4 Simplifying u = -2.4
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