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Simplifying u + -2u + 20 = 12 Reorder the terms: 20 + u + -2u = 12 Combine like terms: u + -2u = -1u 20 + -1u = 12 Solving 20 + -1u = 12 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-20' to each side of the equation. 20 + -20 + -1u = 12 + -20 Combine like terms: 20 + -20 = 0 0 + -1u = 12 + -20 -1u = 12 + -20 Combine like terms: 12 + -20 = -8 -1u = -8 Divide each side by '-1'. u = 8 Simplifying u = 8
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