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Simplifying 20 = 2(u + 8) + -6u Reorder the terms: 20 = 2(8 + u) + -6u 20 = (8 * 2 + u * 2) + -6u 20 = (16 + 2u) + -6u Combine like terms: 2u + -6u = -4u 20 = 16 + -4u Solving 20 = 16 + -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. 20 + 4u = 16 + -4u + 4u Combine like terms: -4u + 4u = 0 20 + 4u = 16 + 0 20 + 4u = 16 Add '-20' to each side of the equation. 20 + -20 + 4u = 16 + -20 Combine like terms: 20 + -20 = 0 0 + 4u = 16 + -20 4u = 16 + -20 Combine like terms: 16 + -20 = -4 4u = -4 Divide each side by '4'. u = -1 Simplifying u = -1
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