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Simplifying (u + -4) * 7 = 21 Reorder the terms: (-4 + u) * 7 = 21 Reorder the terms for easier multiplication: 7(-4 + u) = 21 (-4 * 7 + u * 7) = 21 (-28 + 7u) = 21 Solving -28 + 7u = 21 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '28' to each side of the equation. -28 + 28 + 7u = 21 + 28 Combine like terms: -28 + 28 = 0 0 + 7u = 21 + 28 7u = 21 + 28 Combine like terms: 21 + 28 = 49 7u = 49 Divide each side by '7'. u = 7 Simplifying u = 7
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