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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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