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Simplifying 3u + 9 = 7u + 13 Reorder the terms: 9 + 3u = 7u + 13 Reorder the terms: 9 + 3u = 13 + 7u Solving 9 + 3u = 13 + 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. 9 + 3u + -7u = 13 + 7u + -7u Combine like terms: 3u + -7u = -4u 9 + -4u = 13 + 7u + -7u Combine like terms: 7u + -7u = 0 9 + -4u = 13 + 0 9 + -4u = 13 Add '-9' to each side of the equation. 9 + -9 + -4u = 13 + -9 Combine like terms: 9 + -9 = 0 0 + -4u = 13 + -9 -4u = 13 + -9 Combine like terms: 13 + -9 = 4 -4u = 4 Divide each side by '-4'. u = -1 Simplifying u = -1
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