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Simplifying 3u + 7v = 21 Solving 3u + 7v = 21 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-7v' to each side of the equation. 3u + 7v + -7v = 21 + -7v Combine like terms: 7v + -7v = 0 3u + 0 = 21 + -7v 3u = 21 + -7v Divide each side by '3'. u = 7 + -2.333333333v Simplifying u = 7 + -2.333333333v
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