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Simplifying -7u + -15 = 9(u + 9) Reorder the terms: -15 + -7u = 9(u + 9) Reorder the terms: -15 + -7u = 9(9 + u) -15 + -7u = (9 * 9 + u * 9) -15 + -7u = (81 + 9u) Solving -15 + -7u = 81 + 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. -15 + -7u + -9u = 81 + 9u + -9u Combine like terms: -7u + -9u = -16u -15 + -16u = 81 + 9u + -9u Combine like terms: 9u + -9u = 0 -15 + -16u = 81 + 0 -15 + -16u = 81 Add '15' to each side of the equation. -15 + 15 + -16u = 81 + 15 Combine like terms: -15 + 15 = 0 0 + -16u = 81 + 15 -16u = 81 + 15 Combine like terms: 81 + 15 = 96 -16u = 96 Divide each side by '-16'. u = -6 Simplifying u = -6
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