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Simplifying 3u + -21 = 2u + 18 + -12u Reorder the terms: -21 + 3u = 2u + 18 + -12u Reorder the terms: -21 + 3u = 18 + 2u + -12u Combine like terms: 2u + -12u = -10u -21 + 3u = 18 + -10u Solving -21 + 3u = 18 + -10u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '10u' to each side of the equation. -21 + 3u + 10u = 18 + -10u + 10u Combine like terms: 3u + 10u = 13u -21 + 13u = 18 + -10u + 10u Combine like terms: -10u + 10u = 0 -21 + 13u = 18 + 0 -21 + 13u = 18 Add '21' to each side of the equation. -21 + 21 + 13u = 18 + 21 Combine like terms: -21 + 21 = 0 0 + 13u = 18 + 21 13u = 18 + 21 Combine like terms: 18 + 21 = 39 13u = 39 Divide each side by '13'. u = 3 Simplifying u = 3
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