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Simplifying -28 = 7(u + -6) + -5u Reorder the terms: -28 = 7(-6 + u) + -5u -28 = (-6 * 7 + u * 7) + -5u -28 = (-42 + 7u) + -5u Combine like terms: 7u + -5u = 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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