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Simplifying -3u + 12u = 7u + 30 Combine like terms: -3u + 12u = 9u 9u = 7u + 30 Reorder the terms: 9u = 30 + 7u Solving 9u = 30 + 7u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-7u' to each side of the equation. 9u + -7u = 30 + 7u + -7u Combine like terms: 9u + -7u = 2u 2u = 30 + 7u + -7u Combine like terms: 7u + -7u = 0 2u = 30 + 0 2u = 30 Divide each side by '2'. u = 15 Simplifying u = 15
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