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Simplifying 84 = -4(3 + -8u) 84 = (3 * -4 + -8u * -4) 84 = (-12 + 32u) Solving 84 = -12 + 32u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-32u' to each side of the equation. 84 + -32u = -12 + 32u + -32u Combine like terms: 32u + -32u = 0 84 + -32u = -12 + 0 84 + -32u = -12 Add '-84' to each side of the equation. 84 + -84 + -32u = -12 + -84 Combine like terms: 84 + -84 = 0 0 + -32u = -12 + -84 -32u = -12 + -84 Combine like terms: -12 + -84 = -96 -32u = -96 Divide each side by '-32'. u = 3 Simplifying u = 3
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