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Simplifying -21u + 84 = -15u + -20 Reorder the terms: 84 + -21u = -15u + -20 Reorder the terms: 84 + -21u = -20 + -15u Solving 84 + -21u = -20 + -15u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '15u' to each side of the equation. 84 + -21u + 15u = -20 + -15u + 15u Combine like terms: -21u + 15u = -6u 84 + -6u = -20 + -15u + 15u Combine like terms: -15u + 15u = 0 84 + -6u = -20 + 0 84 + -6u = -20 Add '-84' to each side of the equation. 84 + -84 + -6u = -20 + -84 Combine like terms: 84 + -84 = 0 0 + -6u = -20 + -84 -6u = -20 + -84 Combine like terms: -20 + -84 = -104 -6u = -104 Divide each side by '-6'. u = 17.33333333 Simplifying u = 17.33333333
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