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Simplifying 2(u + -1) = 9u + -9 Reorder the terms: 2(-1 + u) = 9u + -9 (-1 * 2 + u * 2) = 9u + -9 (-2 + 2u) = 9u + -9 Reorder the terms: -2 + 2u = -9 + 9u Solving -2 + 2u = -9 + 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. -2 + 2u + -9u = -9 + 9u + -9u Combine like terms: 2u + -9u = -7u -2 + -7u = -9 + 9u + -9u Combine like terms: 9u + -9u = 0 -2 + -7u = -9 + 0 -2 + -7u = -9 Add '2' to each side of the equation. -2 + 2 + -7u = -9 + 2 Combine like terms: -2 + 2 = 0 0 + -7u = -9 + 2 -7u = -9 + 2 Combine like terms: -9 + 2 = -7 -7u = -7 Divide each side by '-7'. u = 1 Simplifying u = 1
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