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Simplifying -3 + 4u = 21 Solving -3 + 4u = 21 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + 4u = 21 + 3 Combine like terms: -3 + 3 = 0 0 + 4u = 21 + 3 4u = 21 + 3 Combine like terms: 21 + 3 = 24 4u = 24 Divide each side by '4'. u = 6 Simplifying u = 6
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