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Simplifying 13 = 3(u + 3) + -5u Reorder the terms: 13 = 3(3 + u) + -5u 13 = (3 * 3 + u * 3) + -5u 13 = (9 + 3u) + -5u Combine like terms: 3u + -5u = -2u 13 = 9 + -2u Solving 13 = 9 + -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 = 9 + -2u + 2u Combine like terms: -2u + 2u = 0 13 + 2u = 9 + 0 13 + 2u = 9 Add '-13' to each side of the equation. 13 + -13 + 2u = 9 + -13 Combine like terms: 13 + -13 = 0 0 + 2u = 9 + -13 2u = 9 + -13 Combine like terms: 9 + -13 = -4 2u = -4 Divide each side by '2'. u = -2 Simplifying u = -2
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