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Simplifying 21 = v + 2v Combine like terms: v + 2v = 3v 21 = 3v Solving 21 = 3v Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '-3v' to each side of the equation. 21 + -3v = 3v + -3v Combine like terms: 3v + -3v = 0 21 + -3v = 0 Add '-21' to each side of the equation. 21 + -21 + -3v = 0 + -21 Combine like terms: 21 + -21 = 0 0 + -3v = 0 + -21 -3v = 0 + -21 Combine like terms: 0 + -21 = -21 -3v = -21 Divide each side by '-3'. v = 7 Simplifying v = 7
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