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Simplifying 3u + 6y = 21 Solving 3u + 6y = 21 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-6y' to each side of the equation. 3u + 6y + -6y = 21 + -6y Combine like terms: 6y + -6y = 0 3u + 0 = 21 + -6y 3u = 21 + -6y Divide each side by '3'. u = 7 + -2y Simplifying u = 7 + -2y
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