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Simplifying 8u + -7 = 21 + 3u Reorder the terms: -7 + 8u = 21 + 3u Solving -7 + 8u = 21 + 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. -7 + 8u + -3u = 21 + 3u + -3u Combine like terms: 8u + -3u = 5u -7 + 5u = 21 + 3u + -3u Combine like terms: 3u + -3u = 0 -7 + 5u = 21 + 0 -7 + 5u = 21 Add '7' to each side of the equation. -7 + 7 + 5u = 21 + 7 Combine like terms: -7 + 7 = 0 0 + 5u = 21 + 7 5u = 21 + 7 Combine like terms: 21 + 7 = 28 5u = 28 Divide each side by '5'. u = 5.6 Simplifying u = 5.6
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