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Simplifying 28 = -8u + 4(u + 4) Reorder the terms: 28 = -8u + 4(4 + u) 28 = -8u + (4 * 4 + u * 4) 28 = -8u + (16 + 4u) Reorder the terms: 28 = 16 + -8u + 4u Combine like terms: -8u + 4u = -4u 28 = 16 + -4u Solving 28 = 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. 28 + 4u = 16 + -4u + 4u Combine like terms: -4u + 4u = 0 28 + 4u = 16 + 0 28 + 4u = 16 Add '-28' to each side of the equation. 28 + -28 + 4u = 16 + -28 Combine like terms: 28 + -28 = 0 0 + 4u = 16 + -28 4u = 16 + -28 Combine like terms: 16 + -28 = -12 4u = -12 Divide each side by '4'. u = -3 Simplifying u = -3
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