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Simplifying 399 = 57u Solving 399 = 57u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-57u' to each side of the equation. 399 + -57u = 57u + -57u Combine like terms: 57u + -57u = 0 399 + -57u = 0 Add '-399' to each side of the equation. 399 + -399 + -57u = 0 + -399 Combine like terms: 399 + -399 = 0 0 + -57u = 0 + -399 -57u = 0 + -399 Combine like terms: 0 + -399 = -399 -57u = -399 Divide each side by '-57'. u = 7 Simplifying u = 7
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