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Simplifying -9u + -21 = 3(u + -3) Reorder the terms: -21 + -9u = 3(u + -3) Reorder the terms: -21 + -9u = 3(-3 + u) -21 + -9u = (-3 * 3 + u * 3) -21 + -9u = (-9 + 3u) Solving -21 + -9u = -9 + 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 + -9u + -3u = -9 + 3u + -3u Combine like terms: -9u + -3u = -12u -21 + -12u = -9 + 3u + -3u Combine like terms: 3u + -3u = 0 -21 + -12u = -9 + 0 -21 + -12u = -9 Add '21' to each side of the equation. -21 + 21 + -12u = -9 + 21 Combine like terms: -21 + 21 = 0 0 + -12u = -9 + 21 -12u = -9 + 21 Combine like terms: -9 + 21 = 12 -12u = 12 Divide each side by '-12'. u = -1 Simplifying u = -1
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