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Simplifying -20 = -4u + 7(u + -5) Reorder the terms: -20 = -4u + 7(-5 + u) -20 = -4u + (-5 * 7 + u * 7) -20 = -4u + (-35 + 7u) Reorder the terms: -20 = -35 + -4u + 7u Combine like terms: -4u + 7u = 3u -20 = -35 + 3u Solving -20 = -35 + 3u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-3u' to each side of the equation. -20 + -3u = -35 + 3u + -3u Combine like terms: 3u + -3u = 0 -20 + -3u = -35 + 0 -20 + -3u = -35 Add '20' to each side of the equation. -20 + 20 + -3u = -35 + 20 Combine like terms: -20 + 20 = 0 0 + -3u = -35 + 20 -3u = -35 + 20 Combine like terms: -35 + 20 = -15 -3u = -15 Divide each side by '-3'. u = 5 Simplifying u = 5
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