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Simplifying 2(9) = u + -5(9) Multiply 2 * 9 18 = u + -5(9) Multiply -5 * 9 18 = u + -45 Reorder the terms: 18 = -45 + u Solving 18 = -45 + u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-1u' to each side of the equation. 18 + -1u = -45 + u + -1u Combine like terms: u + -1u = 0 18 + -1u = -45 + 0 18 + -1u = -45 Add '-18' to each side of the equation. 18 + -18 + -1u = -45 + -18 Combine like terms: 18 + -18 = 0 0 + -1u = -45 + -18 -1u = -45 + -18 Combine like terms: -45 + -18 = -63 -1u = -63 Divide each side by '-1'. u = 63 Simplifying u = 63
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