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Simplifying (u + -7) * 7 = 42 Reorder the terms: (-7 + u) * 7 = 42 Reorder the terms for easier multiplication: 7(-7 + u) = 42 (-7 * 7 + u * 7) = 42 (-49 + 7u) = 42 Solving -49 + 7u = 42 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '49' to each side of the equation. -49 + 49 + 7u = 42 + 49 Combine like terms: -49 + 49 = 0 0 + 7u = 42 + 49 7u = 42 + 49 Combine like terms: 42 + 49 = 91 7u = 91 Divide each side by '7'. u = 13 Simplifying u = 13
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