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Simplifying 3u + -12 = 9u Reorder the terms: -12 + 3u = 9u Solving -12 + 3u = 9u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-9u' to each side of the equation. -12 + 3u + -9u = 9u + -9u Combine like terms: 3u + -9u = -6u -12 + -6u = 9u + -9u Combine like terms: 9u + -9u = 0 -12 + -6u = 0 Add '12' to each side of the equation. -12 + 12 + -6u = 0 + 12 Combine like terms: -12 + 12 = 0 0 + -6u = 0 + 12 -6u = 0 + 12 Combine like terms: 0 + 12 = 12 -6u = 12 Divide each side by '-6'. u = -2 Simplifying u = -2
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