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Simplifying 3 = 3(u + 5) + -7u Reorder the terms: 3 = 3(5 + u) + -7u 3 = (5 * 3 + u * 3) + -7u 3 = (15 + 3u) + -7u Combine like terms: 3u + -7u = -4u 3 = 15 + -4u Solving 3 = 15 + -4u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '4u' to each side of the equation. 3 + 4u = 15 + -4u + 4u Combine like terms: -4u + 4u = 0 3 + 4u = 15 + 0 3 + 4u = 15 Add '-3' to each side of the equation. 3 + -3 + 4u = 15 + -3 Combine like terms: 3 + -3 = 0 0 + 4u = 15 + -3 4u = 15 + -3 Combine like terms: 15 + -3 = 12 4u = 12 Divide each side by '4'. u = 3 Simplifying u = 3
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