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Simplifying 138 = 3(4 + -7v) 138 = (4 * 3 + -7v * 3) 138 = (12 + -21v) Solving 138 = 12 + -21v Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '21v' to each side of the equation. 138 + 21v = 12 + -21v + 21v Combine like terms: -21v + 21v = 0 138 + 21v = 12 + 0 138 + 21v = 12 Add '-138' to each side of the equation. 138 + -138 + 21v = 12 + -138 Combine like terms: 138 + -138 = 0 0 + 21v = 12 + -138 21v = 12 + -138 Combine like terms: 12 + -138 = -126 21v = -126 Divide each side by '21'. v = -6 Simplifying v = -6
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