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Simplifying -99 = -9(u + 7) Reorder the terms: -99 = -9(7 + u) -99 = (7 * -9 + u * -9) -99 = (-63 + -9u) Solving -99 = -63 + -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. -99 + 9u = -63 + -9u + 9u Combine like terms: -9u + 9u = 0 -99 + 9u = -63 + 0 -99 + 9u = -63 Add '99' to each side of the equation. -99 + 99 + 9u = -63 + 99 Combine like terms: -99 + 99 = 0 0 + 9u = -63 + 99 9u = -63 + 99 Combine like terms: -63 + 99 = 36 9u = 36 Divide each side by '9'. u = 4 Simplifying u = 4
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