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Simplifying (u + -9) * 7 = 21 Reorder the terms: (-9 + u) * 7 = 21 Reorder the terms for easier multiplication: 7(-9 + u) = 21 (-9 * 7 + u * 7) = 21 (-63 + 7u) = 21 Solving -63 + 7u = 21 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '63' to each side of the equation. -63 + 63 + 7u = 21 + 63 Combine like terms: -63 + 63 = 0 0 + 7u = 21 + 63 7u = 21 + 63 Combine like terms: 21 + 63 = 84 7u = 84 Divide each side by '7'. u = 12 Simplifying u = 12
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