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Simplifying -3u = -12 + u Solving -3u = -12 + u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-1u' to each side of the equation. -3u + -1u = -12 + u + -1u Combine like terms: -3u + -1u = -4u -4u = -12 + u + -1u Combine like terms: u + -1u = 0 -4u = -12 + 0 -4u = -12 Divide each side by '-4'. u = 3 Simplifying u = 3
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