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Simplifying -7(u + -1) = -9u + -13 Reorder the terms: -7(-1 + u) = -9u + -13 (-1 * -7 + u * -7) = -9u + -13 (7 + -7u) = -9u + -13 Reorder the terms: 7 + -7u = -13 + -9u Solving 7 + -7u = -13 + -9u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '9u' to each side of the equation. 7 + -7u + 9u = -13 + -9u + 9u Combine like terms: -7u + 9u = 2u 7 + 2u = -13 + -9u + 9u Combine like terms: -9u + 9u = 0 7 + 2u = -13 + 0 7 + 2u = -13 Add '-7' to each side of the equation. 7 + -7 + 2u = -13 + -7 Combine like terms: 7 + -7 = 0 0 + 2u = -13 + -7 2u = -13 + -7 Combine like terms: -13 + -7 = -20 2u = -20 Divide each side by '2'. u = -10 Simplifying u = -10
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