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Simplifying -28 = 6(u + -7) + -8u Reorder the terms: -28 = 6(-7 + u) + -8u -28 = (-7 * 6 + u * 6) + -8u -28 = (-42 + 6u) + -8u Combine like terms: 6u + -8u = -2u -28 = -42 + -2u Solving -28 = -42 + -2u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '2u' to each side of the equation. -28 + 2u = -42 + -2u + 2u Combine like terms: -2u + 2u = 0 -28 + 2u = -42 + 0 -28 + 2u = -42 Add '28' to each side of the equation. -28 + 28 + 2u = -42 + 28 Combine like terms: -28 + 28 = 0 0 + 2u = -42 + 28 2u = -42 + 28 Combine like terms: -42 + 28 = -14 2u = -14 Divide each side by '2'. u = -7 Simplifying u = -7
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