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Simplifying 42 = 3u + -15 Reorder the terms: 42 = -15 + 3u Solving 42 = -15 + 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. 42 + -3u = -15 + 3u + -3u Combine like terms: 3u + -3u = 0 42 + -3u = -15 + 0 42 + -3u = -15 Add '-42' to each side of the equation. 42 + -42 + -3u = -15 + -42 Combine like terms: 42 + -42 = 0 0 + -3u = -15 + -42 -3u = -15 + -42 Combine like terms: -15 + -42 = -57 -3u = -57 Divide each side by '-3'. u = 19 Simplifying u = 19
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