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Simplifying 4(u + 7) = -3u + -21 Reorder the terms: 4(7 + u) = -3u + -21 (7 * 4 + u * 4) = -3u + -21 (28 + 4u) = -3u + -21 Reorder the terms: 28 + 4u = -21 + -3u Solving 28 + 4u = -21 + -3u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '3u' to each side of the equation. 28 + 4u + 3u = -21 + -3u + 3u Combine like terms: 4u + 3u = 7u 28 + 7u = -21 + -3u + 3u Combine like terms: -3u + 3u = 0 28 + 7u = -21 + 0 28 + 7u = -21 Add '-28' to each side of the equation. 28 + -28 + 7u = -21 + -28 Combine like terms: 28 + -28 = 0 0 + 7u = -21 + -28 7u = -21 + -28 Combine like terms: -21 + -28 = -49 7u = -49 Divide each side by '7'. u = -7 Simplifying u = -7
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