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Simplifying -6u + -21 = 3(u + -1) Reorder the terms: -21 + -6u = 3(u + -1) Reorder the terms: -21 + -6u = 3(-1 + u) -21 + -6u = (-1 * 3 + u * 3) -21 + -6u = (-3 + 3u) Solving -21 + -6u = -3 + 3u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-3u' to each side of the equation. -21 + -6u + -3u = -3 + 3u + -3u Combine like terms: -6u + -3u = -9u -21 + -9u = -3 + 3u + -3u Combine like terms: 3u + -3u = 0 -21 + -9u = -3 + 0 -21 + -9u = -3 Add '21' to each side of the equation. -21 + 21 + -9u = -3 + 21 Combine like terms: -21 + 21 = 0 0 + -9u = -3 + 21 -9u = -3 + 21 Combine like terms: -3 + 21 = 18 -9u = 18 Divide each side by '-9'. u = -2 Simplifying u = -2
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