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Simplifying -30 = -7u + 4(u + -3) Reorder the terms: -30 = -7u + 4(-3 + u) -30 = -7u + (-3 * 4 + u * 4) -30 = -7u + (-12 + 4u) Reorder the terms: -30 = -12 + -7u + 4u Combine like terms: -7u + 4u = -3u -30 = -12 + -3u Solving -30 = -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. -30 + 3u = -12 + -3u + 3u Combine like terms: -3u + 3u = 0 -30 + 3u = -12 + 0 -30 + 3u = -12 Add '30' to each side of the equation. -30 + 30 + 3u = -12 + 30 Combine like terms: -30 + 30 = 0 0 + 3u = -12 + 30 3u = -12 + 30 Combine like terms: -12 + 30 = 18 3u = 18 Divide each side by '3'. u = 6 Simplifying u = 6
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