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Simplifying 2u + 9 = 7u + 15 + -1u + -20 Reorder the terms: 9 + 2u = 7u + 15 + -1u + -20 Reorder the terms: 9 + 2u = 15 + -20 + 7u + -1u Combine like terms: 15 + -20 = -5 9 + 2u = -5 + 7u + -1u Combine like terms: 7u + -1u = 6u 9 + 2u = -5 + 6u Solving 9 + 2u = -5 + 6u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-6u' to each side of the equation. 9 + 2u + -6u = -5 + 6u + -6u Combine like terms: 2u + -6u = -4u 9 + -4u = -5 + 6u + -6u Combine like terms: 6u + -6u = 0 9 + -4u = -5 + 0 9 + -4u = -5 Add '-9' to each side of the equation. 9 + -9 + -4u = -5 + -9 Combine like terms: 9 + -9 = 0 0 + -4u = -5 + -9 -4u = -5 + -9 Combine like terms: -5 + -9 = -14 -4u = -14 Divide each side by '-4'. u = 3.5 Simplifying u = 3.5
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