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Simplifying -7u + 5(u + 4) = 12 Reorder the terms: -7u + 5(4 + u) = 12 -7u + (4 * 5 + u * 5) = 12 -7u + (20 + 5u) = 12 Reorder the terms: 20 + -7u + 5u = 12 Combine like terms: -7u + 5u = -2u 20 + -2u = 12 Solving 20 + -2u = 12 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-20' to each side of the equation. 20 + -20 + -2u = 12 + -20 Combine like terms: 20 + -20 = 0 0 + -2u = 12 + -20 -2u = 12 + -20 Combine like terms: 12 + -20 = -8 -2u = -8 Divide each side by '-2'. u = 4 Simplifying u = 4
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