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Simplifying 28 = -7(u + 1) Reorder the terms: 28 = -7(1 + u) 28 = (1 * -7 + u * -7) 28 = (-7 + -7u) Solving 28 = -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. 28 + 7u = -7 + -7u + 7u Combine like terms: -7u + 7u = 0 28 + 7u = -7 + 0 28 + 7u = -7 Add '-28' to each side of the equation. 28 + -28 + 7u = -7 + -28 Combine like terms: 28 + -28 = 0 0 + 7u = -7 + -28 7u = -7 + -28 Combine like terms: -7 + -28 = -35 7u = -35 Divide each side by '7'. u = -5 Simplifying u = -5
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