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Simplifying 21 = -8u Solving 21 = -8u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '8u' to each side of the equation. 21 + 8u = -8u + 8u Combine like terms: -8u + 8u = 0 21 + 8u = 0 Add '-21' to each side of the equation. 21 + -21 + 8u = 0 + -21 Combine like terms: 21 + -21 = 0 0 + 8u = 0 + -21 8u = 0 + -21 Combine like terms: 0 + -21 = -21 8u = -21 Divide each side by '8'. u = -2.625 Simplifying u = -2.625
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