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Simplifying -15 = 3(u + 7) + 3u Reorder the terms: -15 = 3(7 + u) + 3u -15 = (7 * 3 + u * 3) + 3u -15 = (21 + 3u) + 3u Combine like terms: 3u + 3u = 6u -15 = 21 + 6u Solving -15 = 21 + 6u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-6u' to each side of the equation. -15 + -6u = 21 + 6u + -6u Combine like terms: 6u + -6u = 0 -15 + -6u = 21 + 0 -15 + -6u = 21 Add '15' to each side of the equation. -15 + 15 + -6u = 21 + 15 Combine like terms: -15 + 15 = 0 0 + -6u = 21 + 15 -6u = 21 + 15 Combine like terms: 21 + 15 = 36 -6u = 36 Divide each side by '-6'. u = -6 Simplifying u = -6
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