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Simplifying -7 = -7u + 3(u + 3) Reorder the terms: -7 = -7u + 3(3 + u) -7 = -7u + (3 * 3 + u * 3) -7 = -7u + (9 + 3u) Reorder the terms: -7 = 9 + -7u + 3u Combine like terms: -7u + 3u = -4u -7 = 9 + -4u Solving -7 = 9 + -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. -7 + 4u = 9 + -4u + 4u Combine like terms: -4u + 4u = 0 -7 + 4u = 9 + 0 -7 + 4u = 9 Add '7' to each side of the equation. -7 + 7 + 4u = 9 + 7 Combine like terms: -7 + 7 = 0 0 + 4u = 9 + 7 4u = 9 + 7 Combine like terms: 9 + 7 = 16 4u = 16 Divide each side by '4'. u = 4 Simplifying u = 4
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