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Simplifying 3u = (7u + -8) + -12 Reorder the terms: 3u = (-8 + 7u) + -12 Remove parenthesis around (-8 + 7u) 3u = -8 + 7u + -12 Reorder the terms: 3u = -8 + -12 + 7u Combine like terms: -8 + -12 = -20 3u = -20 + 7u Solving 3u = -20 + 7u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-7u' to each side of the equation. 3u + -7u = -20 + 7u + -7u Combine like terms: 3u + -7u = -4u -4u = -20 + 7u + -7u Combine like terms: 7u + -7u = 0 -4u = -20 + 0 -4u = -20 Divide each side by '-4'. u = 5 Simplifying u = 5
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