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Simplifying (u + -3) * 7 = 21 Reorder the terms: (-3 + u) * 7 = 21 Reorder the terms for easier multiplication: 7(-3 + u) = 21 (-3 * 7 + u * 7) = 21 (-21 + 7u) = 21 Solving -21 + 7u = 21 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '21' to each side of the equation. -21 + 21 + 7u = 21 + 21 Combine like terms: -21 + 21 = 0 0 + 7u = 21 + 21 7u = 21 + 21 Combine like terms: 21 + 21 = 42 7u = 42 Divide each side by '7'. u = 6 Simplifying u = 6
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