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Simplifying 3u + 9 + -8u = -31 Reorder the terms: 9 + 3u + -8u = -31 Combine like terms: 3u + -8u = -5u 9 + -5u = -31 Solving 9 + -5u = -31 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + -5u = -31 + -9 Combine like terms: 9 + -9 = 0 0 + -5u = -31 + -9 -5u = -31 + -9 Combine like terms: -31 + -9 = -40 -5u = -40 Divide each side by '-5'. u = 8 Simplifying u = 8
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