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Simplifying 21 = 3u + -15 Reorder the terms: 21 = -15 + 3u Solving 21 = -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. 21 + -3u = -15 + 3u + -3u Combine like terms: 3u + -3u = 0 21 + -3u = -15 + 0 21 + -3u = -15 Add '-21' to each side of the equation. 21 + -21 + -3u = -15 + -21 Combine like terms: 21 + -21 = 0 0 + -3u = -15 + -21 -3u = -15 + -21 Combine like terms: -15 + -21 = -36 -3u = -36 Divide each side by '-3'. u = 12 Simplifying u = 12
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