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Simplifying -20 = 4(u + -2) + -7u Reorder the terms: -20 = 4(-2 + u) + -7u -20 = (-2 * 4 + u * 4) + -7u -20 = (-8 + 4u) + -7u Combine like terms: 4u + -7u = -3u -20 = -8 + -3u Solving -20 = -8 + -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. -20 + 3u = -8 + -3u + 3u Combine like terms: -3u + 3u = 0 -20 + 3u = -8 + 0 -20 + 3u = -8 Add '20' to each side of the equation. -20 + 20 + 3u = -8 + 20 Combine like terms: -20 + 20 = 0 0 + 3u = -8 + 20 3u = -8 + 20 Combine like terms: -8 + 20 = 12 3u = 12 Divide each side by '3'. u = 4 Simplifying u = 4
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