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Simplifying 13 = -2u + 5(u + 5) Reorder the terms: 13 = -2u + 5(5 + u) 13 = -2u + (5 * 5 + u * 5) 13 = -2u + (25 + 5u) Reorder the terms: 13 = 25 + -2u + 5u Combine like terms: -2u + 5u = 3u 13 = 25 + 3u Solving 13 = 25 + 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. 13 + -3u = 25 + 3u + -3u Combine like terms: 3u + -3u = 0 13 + -3u = 25 + 0 13 + -3u = 25 Add '-13' to each side of the equation. 13 + -13 + -3u = 25 + -13 Combine like terms: 13 + -13 = 0 0 + -3u = 25 + -13 -3u = 25 + -13 Combine like terms: 25 + -13 = 12 -3u = 12 Divide each side by '-3'. u = -4 Simplifying u = -4
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