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Simplifying 39 = 7(u + 3) + 8u Reorder the terms: 39 = 7(3 + u) + 8u 39 = (3 * 7 + u * 7) + 8u 39 = (21 + 7u) + 8u Combine like terms: 7u + 8u = 15u 39 = 21 + 15u Solving 39 = 21 + 15u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-15u' to each side of the equation. 39 + -15u = 21 + 15u + -15u Combine like terms: 15u + -15u = 0 39 + -15u = 21 + 0 39 + -15u = 21 Add '-39' to each side of the equation. 39 + -39 + -15u = 21 + -39 Combine like terms: 39 + -39 = 0 0 + -15u = 21 + -39 -15u = 21 + -39 Combine like terms: 21 + -39 = -18 -15u = -18 Divide each side by '-15'. u = 1.2 Simplifying u = 1.2
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