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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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