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