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Simplifying u + 21 = 2u + 3 Reorder the terms: 21 + u = 2u + 3 Reorder the terms: 21 + u = 3 + 2u Solving 21 + u = 3 + 2u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-2u' to each side of the equation. 21 + u + -2u = 3 + 2u + -2u Combine like terms: u + -2u = -1u 21 + -1u = 3 + 2u + -2u Combine like terms: 2u + -2u = 0 21 + -1u = 3 + 0 21 + -1u = 3 Add '-21' to each side of the equation. 21 + -21 + -1u = 3 + -21 Combine like terms: 21 + -21 = 0 0 + -1u = 3 + -21 -1u = 3 + -21 Combine like terms: 3 + -21 = -18 -1u = -18 Divide each side by '-1'. u = 18 Simplifying u = 18
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