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Simplifying 3u + -21 = 9(u + 3) Reorder the terms: -21 + 3u = 9(u + 3) Reorder the terms: -21 + 3u = 9(3 + u) -21 + 3u = (3 * 9 + u * 9) -21 + 3u = (27 + 9u) Solving -21 + 3u = 27 + 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 = 27 + 9u + -9u Combine like terms: 3u + -9u = -6u -21 + -6u = 27 + 9u + -9u Combine like terms: 9u + -9u = 0 -21 + -6u = 27 + 0 -21 + -6u = 27 Add '21' to each side of the equation. -21 + 21 + -6u = 27 + 21 Combine like terms: -21 + 21 = 0 0 + -6u = 27 + 21 -6u = 27 + 21 Combine like terms: 27 + 21 = 48 -6u = 48 Divide each side by '-6'. u = -8 Simplifying u = -8
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