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