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Simplifying 9u + -15 = 7(u + -1) Reorder the terms: -15 + 9u = 7(u + -1) Reorder the terms: -15 + 9u = 7(-1 + u) -15 + 9u = (-1 * 7 + u * 7) -15 + 9u = (-7 + 7u) Solving -15 + 9u = -7 + 7u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-7u' to each side of the equation. -15 + 9u + -7u = -7 + 7u + -7u Combine like terms: 9u + -7u = 2u -15 + 2u = -7 + 7u + -7u Combine like terms: 7u + -7u = 0 -15 + 2u = -7 + 0 -15 + 2u = -7 Add '15' to each side of the equation. -15 + 15 + 2u = -7 + 15 Combine like terms: -15 + 15 = 0 0 + 2u = -7 + 15 2u = -7 + 15 Combine like terms: -7 + 15 = 8 2u = 8 Divide each side by '2'. u = 4 Simplifying u = 4
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