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Simplifying 5.4 = 3u + 9 Reorder the terms: 5.4 = 9 + 3u Solving 5.4 = 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. 5.4 + -3u = 9 + 3u + -3u Combine like terms: 3u + -3u = 0 5.4 + -3u = 9 + 0 5.4 + -3u = 9 Add '-5.4' to each side of the equation. 5.4 + -5.4 + -3u = 9 + -5.4 Combine like terms: 5.4 + -5.4 = 0.0 0.0 + -3u = 9 + -5.4 -3u = 9 + -5.4 Combine like terms: 9 + -5.4 = 3.6 -3u = 3.6 Divide each side by '-3'. u = -1.2 Simplifying u = -1.2
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