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Simplifying -5u + 2(u + -4) = -20 Reorder the terms: -5u + 2(-4 + u) = -20 -5u + (-4 * 2 + u * 2) = -20 -5u + (-8 + 2u) = -20 Reorder the terms: -8 + -5u + 2u = -20 Combine like terms: -5u + 2u = -3u -8 + -3u = -20 Solving -8 + -3u = -20 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '8' to each side of the equation. -8 + 8 + -3u = -20 + 8 Combine like terms: -8 + 8 = 0 0 + -3u = -20 + 8 -3u = -20 + 8 Combine like terms: -20 + 8 = -12 -3u = -12 Divide each side by '-3'. u = 4 Simplifying u = 4
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