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Simplifying 20 = -8u + 4(u + 3) Reorder the terms: 20 = -8u + 4(3 + u) 20 = -8u + (3 * 4 + u * 4) 20 = -8u + (12 + 4u) Reorder the terms: 20 = 12 + -8u + 4u Combine like terms: -8u + 4u = -4u 20 = 12 + -4u Solving 20 = 12 + -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 = 12 + -4u + 4u Combine like terms: -4u + 4u = 0 20 + 4u = 12 + 0 20 + 4u = 12 Add '-20' to each side of the equation. 20 + -20 + 4u = 12 + -20 Combine like terms: 20 + -20 = 0 0 + 4u = 12 + -20 4u = 12 + -20 Combine like terms: 12 + -20 = -8 4u = -8 Divide each side by '4'. u = -2 Simplifying u = -2
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