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Simplifying 21 = 4u + 3u Combine like terms: 4u + 3u = 7u 21 = 7u Solving 21 = 7u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-7u' to each side of the equation. 21 + -7u = 7u + -7u Combine like terms: 7u + -7u = 0 21 + -7u = 0 Add '-21' to each side of the equation. 21 + -21 + -7u = 0 + -21 Combine like terms: 21 + -21 = 0 0 + -7u = 0 + -21 -7u = 0 + -21 Combine like terms: 0 + -21 = -21 -7u = -21 Divide each side by '-7'. u = 3 Simplifying u = 3
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