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Simplifying [3u + -6] = 42 Reorder the terms: [-6 + 3u] = 42 Remove brackets around [-6 + 3u] -6 + 3u = 42 Solving -6 + 3u = 42 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + 3u = 42 + 6 Combine like terms: -6 + 6 = 0 0 + 3u = 42 + 6 3u = 42 + 6 Combine like terms: 42 + 6 = 48 3u = 48 Divide each side by '3'. u = 16 Simplifying u = 16
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