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Simplifying -28 = 3(u + -4) + -7u Reorder the terms: -28 = 3(-4 + u) + -7u -28 = (-4 * 3 + u * 3) + -7u -28 = (-12 + 3u) + -7u Combine like terms: 3u + -7u = -4u -28 = -12 + -4u Solving -28 = -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. -28 + 4u = -12 + -4u + 4u Combine like terms: -4u + 4u = 0 -28 + 4u = -12 + 0 -28 + 4u = -12 Add '28' to each side of the equation. -28 + 28 + 4u = -12 + 28 Combine like terms: -28 + 28 = 0 0 + 4u = -12 + 28 4u = -12 + 28 Combine like terms: -12 + 28 = 16 4u = 16 Divide each side by '4'. u = 4 Simplifying u = 4
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