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Simplifying 7(7 + -3u) = u + -1 (7 * 7 + -3u * 7) = u + -1 (49 + -21u) = u + -1 Reorder the terms: 49 + -21u = -1 + u Solving 49 + -21u = -1 + u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-1u' to each side of the equation. 49 + -21u + -1u = -1 + u + -1u Combine like terms: -21u + -1u = -22u 49 + -22u = -1 + u + -1u Combine like terms: u + -1u = 0 49 + -22u = -1 + 0 49 + -22u = -1 Add '-49' to each side of the equation. 49 + -49 + -22u = -1 + -49 Combine like terms: 49 + -49 = 0 0 + -22u = -1 + -49 -22u = -1 + -49 Combine like terms: -1 + -49 = -50 -22u = -50 Divide each side by '-22'. u = 2.272727273 Simplifying u = 2.272727273
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