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Simplifying 7u + 12 = 3u + 9 Reorder the terms: 12 + 7u = 3u + 9 Reorder the terms: 12 + 7u = 9 + 3u Solving 12 + 7u = 9 + 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. 12 + 7u + -3u = 9 + 3u + -3u Combine like terms: 7u + -3u = 4u 12 + 4u = 9 + 3u + -3u Combine like terms: 3u + -3u = 0 12 + 4u = 9 + 0 12 + 4u = 9 Add '-12' to each side of the equation. 12 + -12 + 4u = 9 + -12 Combine like terms: 12 + -12 = 0 0 + 4u = 9 + -12 4u = 9 + -12 Combine like terms: 9 + -12 = -3 4u = -3 Divide each side by '4'. u = -0.75 Simplifying u = -0.75
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