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Simplifying -23 = 5u + 7(u + 7) Reorder the terms: -23 = 5u + 7(7 + u) -23 = 5u + (7 * 7 + u * 7) -23 = 5u + (49 + 7u) Reorder the terms: -23 = 49 + 5u + 7u Combine like terms: 5u + 7u = 12u -23 = 49 + 12u Solving -23 = 49 + 12u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-12u' to each side of the equation. -23 + -12u = 49 + 12u + -12u Combine like terms: 12u + -12u = 0 -23 + -12u = 49 + 0 -23 + -12u = 49 Add '23' to each side of the equation. -23 + 23 + -12u = 49 + 23 Combine like terms: -23 + 23 = 0 0 + -12u = 49 + 23 -12u = 49 + 23 Combine like terms: 49 + 23 = 72 -12u = 72 Divide each side by '-12'. u = -6 Simplifying u = -6
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