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Simplifying -20 = 2(u + -2) + -4u Reorder the terms: -20 = 2(-2 + u) + -4u -20 = (-2 * 2 + u * 2) + -4u -20 = (-4 + 2u) + -4u Combine like terms: 2u + -4u = -2u -20 = -4 + -2u Solving -20 = -4 + -2u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '2u' to each side of the equation. -20 + 2u = -4 + -2u + 2u Combine like terms: -2u + 2u = 0 -20 + 2u = -4 + 0 -20 + 2u = -4 Add '20' to each side of the equation. -20 + 20 + 2u = -4 + 20 Combine like terms: -20 + 20 = 0 0 + 2u = -4 + 20 2u = -4 + 20 Combine like terms: -4 + 20 = 16 2u = 16 Divide each side by '2'. u = 8 Simplifying u = 8
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