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Simplifying (u + -6) * 7 = 21 Reorder the terms: (-6 + u) * 7 = 21 Reorder the terms for easier multiplication: 7(-6 + u) = 21 (-6 * 7 + u * 7) = 21 (-42 + 7u) = 21 Solving -42 + 7u = 21 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '42' to each side of the equation. -42 + 42 + 7u = 21 + 42 Combine like terms: -42 + 42 = 0 0 + 7u = 21 + 42 7u = 21 + 42 Combine like terms: 21 + 42 = 63 7u = 63 Divide each side by '7'. u = 9 Simplifying u = 9
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