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Simplifying -28 = 3(u + -7) + 4u Reorder the terms: -28 = 3(-7 + u) + 4u -28 = (-7 * 3 + u * 3) + 4u -28 = (-21 + 3u) + 4u Combine like terms: 3u + 4u = 7u -28 = -21 + 7u Solving -28 = -21 + 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. -28 + -7u = -21 + 7u + -7u Combine like terms: 7u + -7u = 0 -28 + -7u = -21 + 0 -28 + -7u = -21 Add '28' to each side of the equation. -28 + 28 + -7u = -21 + 28 Combine like terms: -28 + 28 = 0 0 + -7u = -21 + 28 -7u = -21 + 28 Combine like terms: -21 + 28 = 7 -7u = 7 Divide each side by '-7'. u = -1 Simplifying u = -1
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