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Simplifying -21 = 3(u + -3) + -7u Reorder the terms: -21 = 3(-3 + u) + -7u -21 = (-3 * 3 + u * 3) + -7u -21 = (-9 + 3u) + -7u Combine like terms: 3u + -7u = -4u -21 = -9 + -4u Solving -21 = -9 + -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. -21 + 4u = -9 + -4u + 4u Combine like terms: -4u + 4u = 0 -21 + 4u = -9 + 0 -21 + 4u = -9 Add '21' to each side of the equation. -21 + 21 + 4u = -9 + 21 Combine like terms: -21 + 21 = 0 0 + 4u = -9 + 21 4u = -9 + 21 Combine like terms: -9 + 21 = 12 4u = 12 Divide each side by '4'. u = 3 Simplifying u = 3
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