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Simplifying 21 = v + -1(9) Multiply -1 * 9 21 = v + -9 Reorder the terms: 21 = -9 + v Solving 21 = -9 + v Solving for variable 'v'. Move all terms containing v to the left, all other terms to the right. Add '-1v' to each side of the equation. 21 + -1v = -9 + v + -1v Combine like terms: v + -1v = 0 21 + -1v = -9 + 0 21 + -1v = -9 Add '-21' to each side of the equation. 21 + -21 + -1v = -9 + -21 Combine like terms: 21 + -21 = 0 0 + -1v = -9 + -21 -1v = -9 + -21 Combine like terms: -9 + -21 = -30 -1v = -30 Divide each side by '-1'. v = 30 Simplifying v = 30
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