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Simplifying 4u + 6 = -2u + 21 Reorder the terms: 6 + 4u = -2u + 21 Reorder the terms: 6 + 4u = 21 + -2u Solving 6 + 4u = 21 + -2u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '2u' to each side of the equation. 6 + 4u + 2u = 21 + -2u + 2u Combine like terms: 4u + 2u = 6u 6 + 6u = 21 + -2u + 2u Combine like terms: -2u + 2u = 0 6 + 6u = 21 + 0 6 + 6u = 21 Add '-6' to each side of the equation. 6 + -6 + 6u = 21 + -6 Combine like terms: 6 + -6 = 0 0 + 6u = 21 + -6 6u = 21 + -6 Combine like terms: 21 + -6 = 15 6u = 15 Divide each side by '6'. u = 2.5 Simplifying u = 2.5
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