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Simplifying 9 = -7u + 4(u + -3) Reorder the terms: 9 = -7u + 4(-3 + u) 9 = -7u + (-3 * 4 + u * 4) 9 = -7u + (-12 + 4u) Reorder the terms: 9 = -12 + -7u + 4u Combine like terms: -7u + 4u = -3u 9 = -12 + -3u Solving 9 = -12 + -3u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '3u' to each side of the equation. 9 + 3u = -12 + -3u + 3u Combine like terms: -3u + 3u = 0 9 + 3u = -12 + 0 9 + 3u = -12 Add '-9' to each side of the equation. 9 + -9 + 3u = -12 + -9 Combine like terms: 9 + -9 = 0 0 + 3u = -12 + -9 3u = -12 + -9 Combine like terms: -12 + -9 = -21 3u = -21 Divide each side by '3'. u = -7 Simplifying u = -7
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