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Simplifying 21 + 20v = 7v + 6v Combine like terms: 7v + 6v = 13v 21 + 20v = 13v Solving 21 + 20v = 13v Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '-13v' to each side of the equation. 21 + 20v + -13v = 13v + -13v Combine like terms: 20v + -13v = 7v 21 + 7v = 13v + -13v Combine like terms: 13v + -13v = 0 21 + 7v = 0 Add '-21' to each side of the equation. 21 + -21 + 7v = 0 + -21 Combine like terms: 21 + -21 = 0 0 + 7v = 0 + -21 7v = 0 + -21 Combine like terms: 0 + -21 = -21 7v = -21 Divide each side by '7'. v = -3 Simplifying v = -3
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