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Simplifying 3(u + 4) + -7u = -12 Reorder the terms: 3(4 + u) + -7u = -12 (4 * 3 + u * 3) + -7u = -12 (12 + 3u) + -7u = -12 Combine like terms: 3u + -7u = -4u 12 + -4u = -12 Solving 12 + -4u = -12 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 + -4u = -12 + -12 Combine like terms: 12 + -12 = 0 0 + -4u = -12 + -12 -4u = -12 + -12 Combine like terms: -12 + -12 = -24 -4u = -24 Divide each side by '-4'. u = 6 Simplifying u = 6
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