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Simplifying -20 = -5u + 3(u + -2) Reorder the terms: -20 = -5u + 3(-2 + u) -20 = -5u + (-2 * 3 + u * 3) -20 = -5u + (-6 + 3u) Reorder the terms: -20 = -6 + -5u + 3u Combine like terms: -5u + 3u = -2u -20 = -6 + -2u Solving -20 = -6 + -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 = -6 + -2u + 2u Combine like terms: -2u + 2u = 0 -20 + 2u = -6 + 0 -20 + 2u = -6 Add '20' to each side of the equation. -20 + 20 + 2u = -6 + 20 Combine like terms: -20 + 20 = 0 0 + 2u = -6 + 20 2u = -6 + 20 Combine like terms: -6 + 20 = 14 2u = 14 Divide each side by '2'. u = 7 Simplifying u = 7
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