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Simplifying -21 = 6u + -18 + -3u Reorder the terms: -21 = -18 + 6u + -3u Combine like terms: 6u + -3u = 3u -21 = -18 + 3u Solving -21 = -18 + 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. -21 + -3u = -18 + 3u + -3u Combine like terms: 3u + -3u = 0 -21 + -3u = -18 + 0 -21 + -3u = -18 Add '21' to each side of the equation. -21 + 21 + -3u = -18 + 21 Combine like terms: -21 + 21 = 0 0 + -3u = -18 + 21 -3u = -18 + 21 Combine like terms: -18 + 21 = 3 -3u = 3 Divide each side by '-3'. u = -1 Simplifying u = -1
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