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Simplifying 21 = 5 + -2u Solving 21 = 5 + -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 + 2u = 5 + -2u + 2u Combine like terms: -2u + 2u = 0 21 + 2u = 5 + 0 21 + 2u = 5 Add '-21' to each side of the equation. 21 + -21 + 2u = 5 + -21 Combine like terms: 21 + -21 = 0 0 + 2u = 5 + -21 2u = 5 + -21 Combine like terms: 5 + -21 = -16 2u = -16 Divide each side by '2'. u = -8 Simplifying u = -8
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