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Simplifying -30 = 3(u + -4) + -5u Reorder the terms: -30 = 3(-4 + u) + -5u -30 = (-4 * 3 + u * 3) + -5u -30 = (-12 + 3u) + -5u Combine like terms: 3u + -5u = -2u -30 = -12 + -2u Solving -30 = -12 + -2u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '2u' to each side of the equation. -30 + 2u = -12 + -2u + 2u Combine like terms: -2u + 2u = 0 -30 + 2u = -12 + 0 -30 + 2u = -12 Add '30' to each side of the equation. -30 + 30 + 2u = -12 + 30 Combine like terms: -30 + 30 = 0 0 + 2u = -12 + 30 2u = -12 + 30 Combine like terms: -12 + 30 = 18 2u = 18 Divide each side by '2'. u = 9 Simplifying u = 9
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