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Simplifying 3u + 7(u + -3) = -31 Reorder the terms: 3u + 7(-3 + u) = -31 3u + (-3 * 7 + u * 7) = -31 3u + (-21 + 7u) = -31 Reorder the terms: -21 + 3u + 7u = -31 Combine like terms: 3u + 7u = 10u -21 + 10u = -31 Solving -21 + 10u = -31 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 + 10u = -31 + 21 Combine like terms: -21 + 21 = 0 0 + 10u = -31 + 21 10u = -31 + 21 Combine like terms: -31 + 21 = -10 10u = -10 Divide each side by '10'. u = -1 Simplifying u = -1
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