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Simplifying -7u + 4(u + -6) = -21 Reorder the terms: -7u + 4(-6 + u) = -21 -7u + (-6 * 4 + u * 4) = -21 -7u + (-24 + 4u) = -21 Reorder the terms: -24 + -7u + 4u = -21 Combine like terms: -7u + 4u = -3u -24 + -3u = -21 Solving -24 + -3u = -21 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '24' to each side of the equation. -24 + 24 + -3u = -21 + 24 Combine like terms: -24 + 24 = 0 0 + -3u = -21 + 24 -3u = -21 + 24 Combine like terms: -21 + 24 = 3 -3u = 3 Divide each side by '-3'. u = -1 Simplifying u = -1
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