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Simplifying 21 = 4u + -411 Reorder the terms: 21 = -411 + 4u Solving 21 = -411 + 4u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-4u' to each side of the equation. 21 + -4u = -411 + 4u + -4u Combine like terms: 4u + -4u = 0 21 + -4u = -411 + 0 21 + -4u = -411 Add '-21' to each side of the equation. 21 + -21 + -4u = -411 + -21 Combine like terms: 21 + -21 = 0 0 + -4u = -411 + -21 -4u = -411 + -21 Combine like terms: -411 + -21 = -432 -4u = -432 Divide each side by '-4'. u = 108 Simplifying u = 108
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