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Simplifying -9(u + 7) = 6u + -18 Reorder the terms: -9(7 + u) = 6u + -18 (7 * -9 + u * -9) = 6u + -18 (-63 + -9u) = 6u + -18 Reorder the terms: -63 + -9u = -18 + 6u Solving -63 + -9u = -18 + 6u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-6u' to each side of the equation. -63 + -9u + -6u = -18 + 6u + -6u Combine like terms: -9u + -6u = -15u -63 + -15u = -18 + 6u + -6u Combine like terms: 6u + -6u = 0 -63 + -15u = -18 + 0 -63 + -15u = -18 Add '63' to each side of the equation. -63 + 63 + -15u = -18 + 63 Combine like terms: -63 + 63 = 0 0 + -15u = -18 + 63 -15u = -18 + 63 Combine like terms: -18 + 63 = 45 -15u = 45 Divide each side by '-15'. u = -3 Simplifying u = -3
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