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Simplifying 3u + -9 = -21 Reorder the terms: -9 + 3u = -21 Solving -9 + 3u = -21 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 + 3u = -21 + 9 Combine like terms: -9 + 9 = 0 0 + 3u = -21 + 9 3u = -21 + 9 Combine like terms: -21 + 9 = -12 3u = -12 Divide each side by '3'. u = -4 Simplifying u = -4
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