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Simplifying 3 = 4(u + -3) + -7u Reorder the terms: 3 = 4(-3 + u) + -7u 3 = (-3 * 4 + u * 4) + -7u 3 = (-12 + 4u) + -7u Combine like terms: 4u + -7u = -3u 3 = -12 + -3u Solving 3 = -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. 3 + 3u = -12 + -3u + 3u Combine like terms: -3u + 3u = 0 3 + 3u = -12 + 0 3 + 3u = -12 Add '-3' to each side of the equation. 3 + -3 + 3u = -12 + -3 Combine like terms: 3 + -3 = 0 0 + 3u = -12 + -3 3u = -12 + -3 Combine like terms: -12 + -3 = -15 3u = -15 Divide each side by '3'. u = -5 Simplifying u = -5
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