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Simplifying -7v + 4(u + 3) = 21 Reorder the terms: -7v + 4(3 + u) = 21 -7v + (3 * 4 + u * 4) = 21 -7v + (12 + 4u) = 21 Reorder the terms: 12 + 4u + -7v = 21 Solving 12 + 4u + -7v = 21 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-12' to each side of the equation. 12 + 4u + -12 + -7v = 21 + -12 Reorder the terms: 12 + -12 + 4u + -7v = 21 + -12 Combine like terms: 12 + -12 = 0 0 + 4u + -7v = 21 + -12 4u + -7v = 21 + -12 Combine like terms: 21 + -12 = 9 4u + -7v = 9 Add '7v' to each side of the equation. 4u + -7v + 7v = 9 + 7v Combine like terms: -7v + 7v = 0 4u + 0 = 9 + 7v 4u = 9 + 7v Divide each side by '4'. u = 2.25 + 1.75v Simplifying u = 2.25 + 1.75v
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