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Simplifying -7u + 2(u + 3) = -9 Reorder the terms: -7u + 2(3 + u) = -9 -7u + (3 * 2 + u * 2) = -9 -7u + (6 + 2u) = -9 Reorder the terms: 6 + -7u + 2u = -9 Combine like terms: -7u + 2u = -5u 6 + -5u = -9 Solving 6 + -5u = -9 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-6' to each side of the equation. 6 + -6 + -5u = -9 + -6 Combine like terms: 6 + -6 = 0 0 + -5u = -9 + -6 -5u = -9 + -6 Combine like terms: -9 + -6 = -15 -5u = -15 Divide each side by '-5'. u = 3 Simplifying u = 3
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