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Simplifying 84 = -21u Solving 84 = -21u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '21u' to each side of the equation. 84 + 21u = -21u + 21u Combine like terms: -21u + 21u = 0 84 + 21u = 0 Add '-84' to each side of the equation. 84 + -84 + 21u = 0 + -84 Combine like terms: 84 + -84 = 0 0 + 21u = 0 + -84 21u = 0 + -84 Combine like terms: 0 + -84 = -84 21u = -84 Divide each side by '21'. u = -4 Simplifying u = -4
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