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Simplifying -8u + 4(u + 4) = -20 Reorder the terms: -8u + 4(4 + u) = -20 -8u + (4 * 4 + u * 4) = -20 -8u + (16 + 4u) = -20 Reorder the terms: 16 + -8u + 4u = -20 Combine like terms: -8u + 4u = -4u 16 + -4u = -20 Solving 16 + -4u = -20 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-16' to each side of the equation. 16 + -16 + -4u = -20 + -16 Combine like terms: 16 + -16 = 0 0 + -4u = -20 + -16 -4u = -20 + -16 Combine like terms: -20 + -16 = -36 -4u = -36 Divide each side by '-4'. u = 9 Simplifying u = 9
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