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