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Simplifying 3u + -9 = 4u + 12 Reorder the terms: -9 + 3u = 4u + 12 Reorder the terms: -9 + 3u = 12 + 4u Solving -9 + 3u = 12 + 4u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-4u' to each side of the equation. -9 + 3u + -4u = 12 + 4u + -4u Combine like terms: 3u + -4u = -1u -9 + -1u = 12 + 4u + -4u Combine like terms: 4u + -4u = 0 -9 + -1u = 12 + 0 -9 + -1u = 12 Add '9' to each side of the equation. -9 + 9 + -1u = 12 + 9 Combine like terms: -9 + 9 = 0 0 + -1u = 12 + 9 -1u = 12 + 9 Combine like terms: 12 + 9 = 21 -1u = 21 Divide each side by '-1'. u = -21 Simplifying u = -21
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