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Simplifying 28 = 2u + 5(u + -7) Reorder the terms: 28 = 2u + 5(-7 + u) 28 = 2u + (-7 * 5 + u * 5) 28 = 2u + (-35 + 5u) Reorder the terms: 28 = -35 + 2u + 5u Combine like terms: 2u + 5u = 7u 28 = -35 + 7u Solving 28 = -35 + 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 = -35 + 7u + -7u Combine like terms: 7u + -7u = 0 28 + -7u = -35 + 0 28 + -7u = -35 Add '-28' to each side of the equation. 28 + -28 + -7u = -35 + -28 Combine like terms: 28 + -28 = 0 0 + -7u = -35 + -28 -7u = -35 + -28 Combine like terms: -35 + -28 = -63 -7u = -63 Divide each side by '-7'. u = 9 Simplifying u = 9
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