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Simplifying 2u + 7(u + 8) = 20 Reorder the terms: 2u + 7(8 + u) = 20 2u + (8 * 7 + u * 7) = 20 2u + (56 + 7u) = 20 Reorder the terms: 56 + 2u + 7u = 20 Combine like terms: 2u + 7u = 9u 56 + 9u = 20 Solving 56 + 9u = 20 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-56' to each side of the equation. 56 + -56 + 9u = 20 + -56 Combine like terms: 56 + -56 = 0 0 + 9u = 20 + -56 9u = 20 + -56 Combine like terms: 20 + -56 = -36 9u = -36 Divide each side by '9'. u = -4 Simplifying u = -4
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