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Simplifying 3(u + 7) = 7u + -15 Reorder the terms: 3(7 + u) = 7u + -15 (7 * 3 + u * 3) = 7u + -15 (21 + 3u) = 7u + -15 Reorder the terms: 21 + 3u = -15 + 7u Solving 21 + 3u = -15 + 7u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-7u' to each side of the equation. 21 + 3u + -7u = -15 + 7u + -7u Combine like terms: 3u + -7u = -4u 21 + -4u = -15 + 7u + -7u Combine like terms: 7u + -7u = 0 21 + -4u = -15 + 0 21 + -4u = -15 Add '-21' to each side of the equation. 21 + -21 + -4u = -15 + -21 Combine like terms: 21 + -21 = 0 0 + -4u = -15 + -21 -4u = -15 + -21 Combine like terms: -15 + -21 = -36 -4u = -36 Divide each side by '-4'. u = 9 Simplifying u = 9
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