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Simplifying 5(6 + -4u) = u + 21 (6 * 5 + -4u * 5) = u + 21 (30 + -20u) = u + 21 Reorder the terms: 30 + -20u = 21 + u Solving 30 + -20u = 21 + u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-1u' to each side of the equation. 30 + -20u + -1u = 21 + u + -1u Combine like terms: -20u + -1u = -21u 30 + -21u = 21 + u + -1u Combine like terms: u + -1u = 0 30 + -21u = 21 + 0 30 + -21u = 21 Add '-30' to each side of the equation. 30 + -30 + -21u = 21 + -30 Combine like terms: 30 + -30 = 0 0 + -21u = 21 + -30 -21u = 21 + -30 Combine like terms: 21 + -30 = -9 -21u = -9 Divide each side by '-21'. u = 0.4285714286 Simplifying u = 0.4285714286
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