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Simplifying 20 = 3(u + -4) + -7u Reorder the terms: 20 = 3(-4 + u) + -7u 20 = (-4 * 3 + u * 3) + -7u 20 = (-12 + 3u) + -7u Combine like terms: 3u + -7u = -4u 20 = -12 + -4u Solving 20 = -12 + -4u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '4u' to each side of the equation. 20 + 4u = -12 + -4u + 4u Combine like terms: -4u + 4u = 0 20 + 4u = -12 + 0 20 + 4u = -12 Add '-20' to each side of the equation. 20 + -20 + 4u = -12 + -20 Combine like terms: 20 + -20 = 0 0 + 4u = -12 + -20 4u = -12 + -20 Combine like terms: -12 + -20 = -32 4u = -32 Divide each side by '4'. u = -8 Simplifying u = -8
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