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Simplifying 20 = 5(u + 7) + -8u Reorder the terms: 20 = 5(7 + u) + -8u 20 = (7 * 5 + u * 5) + -8u 20 = (35 + 5u) + -8u Combine like terms: 5u + -8u = -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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