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Simplifying -7u + -12 = 20 + -9u Reorder the terms: -12 + -7u = 20 + -9u Solving -12 + -7u = 20 + -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. -12 + -7u + 9u = 20 + -9u + 9u Combine like terms: -7u + 9u = 2u -12 + 2u = 20 + -9u + 9u Combine like terms: -9u + 9u = 0 -12 + 2u = 20 + 0 -12 + 2u = 20 Add '12' to each side of the equation. -12 + 12 + 2u = 20 + 12 Combine like terms: -12 + 12 = 0 0 + 2u = 20 + 12 2u = 20 + 12 Combine like terms: 20 + 12 = 32 2u = 32 Divide each side by '2'. u = 16 Simplifying u = 16
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