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Simplifying 21 = 2u + -9 Reorder the terms: 21 = -9 + 2u Solving 21 = -9 + 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 = -9 + 2u + -2u Combine like terms: 2u + -2u = 0 21 + -2u = -9 + 0 21 + -2u = -9 Add '-21' to each side of the equation. 21 + -21 + -2u = -9 + -21 Combine like terms: 21 + -21 = 0 0 + -2u = -9 + -21 -2u = -9 + -21 Combine like terms: -9 + -21 = -30 -2u = -30 Divide each side by '-2'. u = 15 Simplifying u = 15
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