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Simplifying u + 21 = 4u + 60 Reorder the terms: 21 + u = 4u + 60 Reorder the terms: 21 + u = 60 + 4u Solving 21 + u = 60 + 4u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-4u' to each side of the equation. 21 + u + -4u = 60 + 4u + -4u Combine like terms: u + -4u = -3u 21 + -3u = 60 + 4u + -4u Combine like terms: 4u + -4u = 0 21 + -3u = 60 + 0 21 + -3u = 60 Add '-21' to each side of the equation. 21 + -21 + -3u = 60 + -21 Combine like terms: 21 + -21 = 0 0 + -3u = 60 + -21 -3u = 60 + -21 Combine like terms: 60 + -21 = 39 -3u = 39 Divide each side by '-3'. u = -13 Simplifying u = -13
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