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Simplifying 30 = -7u + 3(u + 6) Reorder the terms: 30 = -7u + 3(6 + u) 30 = -7u + (6 * 3 + u * 3) 30 = -7u + (18 + 3u) Reorder the terms: 30 = 18 + -7u + 3u Combine like terms: -7u + 3u = -4u 30 = 18 + -4u Solving 30 = 18 + -4u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '4u' to each side of the equation. 30 + 4u = 18 + -4u + 4u Combine like terms: -4u + 4u = 0 30 + 4u = 18 + 0 30 + 4u = 18 Add '-30' to each side of the equation. 30 + -30 + 4u = 18 + -30 Combine like terms: 30 + -30 = 0 0 + 4u = 18 + -30 4u = 18 + -30 Combine like terms: 18 + -30 = -12 4u = -12 Divide each side by '4'. u = -3 Simplifying u = -3
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