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Simplifying 7u + -21 = 3u + 15 Reorder the terms: -21 + 7u = 3u + 15 Reorder the terms: -21 + 7u = 15 + 3u Solving -21 + 7u = 15 + 3u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-3u' to each side of the equation. -21 + 7u + -3u = 15 + 3u + -3u Combine like terms: 7u + -3u = 4u -21 + 4u = 15 + 3u + -3u Combine like terms: 3u + -3u = 0 -21 + 4u = 15 + 0 -21 + 4u = 15 Add '21' to each side of the equation. -21 + 21 + 4u = 15 + 21 Combine like terms: -21 + 21 = 0 0 + 4u = 15 + 21 4u = 15 + 21 Combine like terms: 15 + 21 = 36 4u = 36 Divide each side by '4'. u = 9 Simplifying u = 9
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