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