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Simplifying 21(u + 16) = 840 Reorder the terms: 21(16 + u) = 840 (16 * 21 + u * 21) = 840 (336 + 21u) = 840 Solving 336 + 21u = 840 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-336' to each side of the equation. 336 + -336 + 21u = 840 + -336 Combine like terms: 336 + -336 = 0 0 + 21u = 840 + -336 21u = 840 + -336 Combine like terms: 840 + -336 = 504 21u = 504 Divide each side by '21'. u = 24 Simplifying u = 24
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