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Simplifying 91 = 7(u + 6) Reorder the terms: 91 = 7(6 + u) 91 = (6 * 7 + u * 7) 91 = (42 + 7u) Solving 91 = 42 + 7u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-7u' to each side of the equation. 91 + -7u = 42 + 7u + -7u Combine like terms: 7u + -7u = 0 91 + -7u = 42 + 0 91 + -7u = 42 Add '-91' to each side of the equation. 91 + -91 + -7u = 42 + -91 Combine like terms: 91 + -91 = 0 0 + -7u = 42 + -91 -7u = 42 + -91 Combine like terms: 42 + -91 = -49 -7u = -49 Divide each side by '-7'. u = 7 Simplifying u = 7
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