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Simplifying 9u + -7 = 7(u + 1) Reorder the terms: -7 + 9u = 7(u + 1) Reorder the terms: -7 + 9u = 7(1 + u) -7 + 9u = (1 * 7 + u * 7) -7 + 9u = (7 + 7u) Solving -7 + 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. -7 + 9u + -7u = 7 + 7u + -7u Combine like terms: 9u + -7u = 2u -7 + 2u = 7 + 7u + -7u Combine like terms: 7u + -7u = 0 -7 + 2u = 7 + 0 -7 + 2u = 7 Add '7' to each side of the equation. -7 + 7 + 2u = 7 + 7 Combine like terms: -7 + 7 = 0 0 + 2u = 7 + 7 2u = 7 + 7 Combine like terms: 7 + 7 = 14 2u = 14 Divide each side by '2'. u = 7 Simplifying u = 7
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