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Simplifying 21 = 4u + -1u Combine like terms: 4u + -1u = 3u 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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