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Simplifying 13u + -21 = 3u Reorder the terms: -21 + 13u = 3u Solving -21 + 13u = 3u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-3u' to each side of the equation. -21 + 13u + -3u = 3u + -3u Combine like terms: 13u + -3u = 10u -21 + 10u = 3u + -3u Combine like terms: 3u + -3u = 0 -21 + 10u = 0 Add '21' to each side of the equation. -21 + 21 + 10u = 0 + 21 Combine like terms: -21 + 21 = 0 0 + 10u = 0 + 21 10u = 0 + 21 Combine like terms: 0 + 21 = 21 10u = 21 Divide each side by '10'. u = 2.1 Simplifying u = 2.1
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