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Simplifying 13u + 20 = -12 + 9u Reorder the terms: 20 + 13u = -12 + 9u Solving 20 + 13u = -12 + 9u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-9u' to each side of the equation. 20 + 13u + -9u = -12 + 9u + -9u Combine like terms: 13u + -9u = 4u 20 + 4u = -12 + 9u + -9u Combine like terms: 9u + -9u = 0 20 + 4u = -12 + 0 20 + 4u = -12 Add '-20' to each side of the equation. 20 + -20 + 4u = -12 + -20 Combine like terms: 20 + -20 = 0 0 + 4u = -12 + -20 4u = -12 + -20 Combine like terms: -12 + -20 = -32 4u = -32 Divide each side by '4'. u = -8 Simplifying u = -8
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