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Simplifying 13 = 5(u + 3) + -3u Reorder the terms: 13 = 5(3 + u) + -3u 13 = (3 * 5 + u * 5) + -3u 13 = (15 + 5u) + -3u Combine like terms: 5u + -3u = 2u 13 = 15 + 2u Solving 13 = 15 + 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. 13 + -2u = 15 + 2u + -2u Combine like terms: 2u + -2u = 0 13 + -2u = 15 + 0 13 + -2u = 15 Add '-13' to each side of the equation. 13 + -13 + -2u = 15 + -13 Combine like terms: 13 + -13 = 0 0 + -2u = 15 + -13 -2u = 15 + -13 Combine like terms: 15 + -13 = 2 -2u = 2 Divide each side by '-2'. u = -1 Simplifying u = -1
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