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Simplifying 9 = 12 + 7u + 7 Reorder the terms: 9 = 12 + 7 + 7u Combine like terms: 12 + 7 = 19 9 = 19 + 7u Solving 9 = 19 + 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 + -7u = 19 + 7u + -7u Combine like terms: 7u + -7u = 0 9 + -7u = 19 + 0 9 + -7u = 19 Add '-9' to each side of the equation. 9 + -9 + -7u = 19 + -9 Combine like terms: 9 + -9 = 0 0 + -7u = 19 + -9 -7u = 19 + -9 Combine like terms: 19 + -9 = 10 -7u = 10 Divide each side by '-7'. u = -1.428571429 Simplifying u = -1.428571429
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