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Simplifying -21 = -5u Solving -21 = -5u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '5u' to each side of the equation. -21 + 5u = -5u + 5u Combine like terms: -5u + 5u = 0 -21 + 5u = 0 Add '21' to each side of the equation. -21 + 21 + 5u = 0 + 21 Combine like terms: -21 + 21 = 0 0 + 5u = 0 + 21 5u = 0 + 21 Combine like terms: 0 + 21 = 21 5u = 21 Divide each side by '5'. u = 4.2 Simplifying u = 4.2
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