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Simplifying 2u + -13 = 21 Reorder the terms: -13 + 2u = 21 Solving -13 + 2u = 21 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '13' to each side of the equation. -13 + 13 + 2u = 21 + 13 Combine like terms: -13 + 13 = 0 0 + 2u = 21 + 13 2u = 21 + 13 Combine like terms: 21 + 13 = 34 2u = 34 Divide each side by '2'. u = 17 Simplifying u = 17
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