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Simplifying 3 = 3(u + 7) + -6u Reorder the terms: 3 = 3(7 + u) + -6u 3 = (7 * 3 + u * 3) + -6u 3 = (21 + 3u) + -6u Combine like terms: 3u + -6u = -3u 3 = 21 + -3u Solving 3 = 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. 3 + 3u = 21 + -3u + 3u Combine like terms: -3u + 3u = 0 3 + 3u = 21 + 0 3 + 3u = 21 Add '-3' to each side of the equation. 3 + -3 + 3u = 21 + -3 Combine like terms: 3 + -3 = 0 0 + 3u = 21 + -3 3u = 21 + -3 Combine like terms: 21 + -3 = 18 3u = 18 Divide each side by '3'. u = 6 Simplifying u = 6
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