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Simplifying -3u + 15 = 9u + -45 Reorder the terms: 15 + -3u = 9u + -45 Reorder the terms: 15 + -3u = -45 + 9u Solving 15 + -3u = -45 + 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. 15 + -3u + -9u = -45 + 9u + -9u Combine like terms: -3u + -9u = -12u 15 + -12u = -45 + 9u + -9u Combine like terms: 9u + -9u = 0 15 + -12u = -45 + 0 15 + -12u = -45 Add '-15' to each side of the equation. 15 + -15 + -12u = -45 + -15 Combine like terms: 15 + -15 = 0 0 + -12u = -45 + -15 -12u = -45 + -15 Combine like terms: -45 + -15 = -60 -12u = -60 Divide each side by '-12'. u = 5 Simplifying u = 5
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