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Simplifying 4 = 4(u + -5) + -7u Reorder the terms: 4 = 4(-5 + u) + -7u 4 = (-5 * 4 + u * 4) + -7u 4 = (-20 + 4u) + -7u Combine like terms: 4u + -7u = -3u 4 = -20 + -3u Solving 4 = -20 + -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. 4 + 3u = -20 + -3u + 3u Combine like terms: -3u + 3u = 0 4 + 3u = -20 + 0 4 + 3u = -20 Add '-4' to each side of the equation. 4 + -4 + 3u = -20 + -4 Combine like terms: 4 + -4 = 0 0 + 3u = -20 + -4 3u = -20 + -4 Combine like terms: -20 + -4 = -24 3u = -24 Divide each side by '3'. u = -8 Simplifying u = -8
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