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Simplifying -7u + 5(u + 3) = 7 Reorder the terms: -7u + 5(3 + u) = 7 -7u + (3 * 5 + u * 5) = 7 -7u + (15 + 5u) = 7 Reorder the terms: 15 + -7u + 5u = 7 Combine like terms: -7u + 5u = -2u 15 + -2u = 7 Solving 15 + -2u = 7 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-15' to each side of the equation. 15 + -15 + -2u = 7 + -15 Combine like terms: 15 + -15 = 0 0 + -2u = 7 + -15 -2u = 7 + -15 Combine like terms: 7 + -15 = -8 -2u = -8 Divide each side by '-2'. u = 4 Simplifying u = 4
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