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Simplifying -8u + 3(u + 7) = 6 Reorder the terms: -8u + 3(7 + u) = 6 -8u + (7 * 3 + u * 3) = 6 -8u + (21 + 3u) = 6 Reorder the terms: 21 + -8u + 3u = 6 Combine like terms: -8u + 3u = -5u 21 + -5u = 6 Solving 21 + -5u = 6 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + -5u = 6 + -21 Combine like terms: 21 + -21 = 0 0 + -5u = 6 + -21 -5u = 6 + -21 Combine like terms: 6 + -21 = -15 -5u = -15 Divide each side by '-5'. u = 3 Simplifying u = 3
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