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Simplifying 3u + 15 = -9(u + 9) Reorder the terms: 15 + 3u = -9(u + 9) Reorder the terms: 15 + 3u = -9(9 + u) 15 + 3u = (9 * -9 + u * -9) 15 + 3u = (-81 + -9u) Solving 15 + 3u = -81 + -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 = -81 + -9u + 9u Combine like terms: 3u + 9u = 12u 15 + 12u = -81 + -9u + 9u Combine like terms: -9u + 9u = 0 15 + 12u = -81 + 0 15 + 12u = -81 Add '-15' to each side of the equation. 15 + -15 + 12u = -81 + -15 Combine like terms: 15 + -15 = 0 0 + 12u = -81 + -15 12u = -81 + -15 Combine like terms: -81 + -15 = -96 12u = -96 Divide each side by '12'. u = -8 Simplifying u = -8
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