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Simplifying (-2u + 13) + -1(u + 9) = 0 Reorder the terms: (13 + -2u) + -1(u + 9) = 0 Remove parenthesis around (13 + -2u) 13 + -2u + -1(u + 9) = 0 Reorder the terms: 13 + -2u + -1(9 + u) = 0 13 + -2u + (9 * -1 + u * -1) = 0 13 + -2u + (-9 + -1u) = 0 Reorder the terms: 13 + -9 + -2u + -1u = 0 Combine like terms: 13 + -9 = 4 4 + -2u + -1u = 0 Combine like terms: -2u + -1u = -3u 4 + -3u = 0 Solving 4 + -3u = 0 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + -3u = 0 + -4 Combine like terms: 4 + -4 = 0 0 + -3u = 0 + -4 -3u = 0 + -4 Combine like terms: 0 + -4 = -4 -3u = -4 Divide each side by '-3'. u = 1.333333333 Simplifying u = 1.333333333
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