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Simplifying 9(u + 7) = 3u + 15 Reorder the terms: 9(7 + u) = 3u + 15 (7 * 9 + u * 9) = 3u + 15 (63 + 9u) = 3u + 15 Reorder the terms: 63 + 9u = 15 + 3u Solving 63 + 9u = 15 + 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. 63 + 9u + -3u = 15 + 3u + -3u Combine like terms: 9u + -3u = 6u 63 + 6u = 15 + 3u + -3u Combine like terms: 3u + -3u = 0 63 + 6u = 15 + 0 63 + 6u = 15 Add '-63' to each side of the equation. 63 + -63 + 6u = 15 + -63 Combine like terms: 63 + -63 = 0 0 + 6u = 15 + -63 6u = 15 + -63 Combine like terms: 15 + -63 = -48 6u = -48 Divide each side by '6'. u = -8 Simplifying u = -8
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