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Simplifying 31 = 9 + -2z Solving 31 = 9 + -2z Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '2z' to each side of the equation. 31 + 2z = 9 + -2z + 2z Combine like terms: -2z + 2z = 0 31 + 2z = 9 + 0 31 + 2z = 9 Add '-31' to each side of the equation. 31 + -31 + 2z = 9 + -31 Combine like terms: 31 + -31 = 0 0 + 2z = 9 + -31 2z = 9 + -31 Combine like terms: 9 + -31 = -22 2z = -22 Divide each side by '2'. z = -11 Simplifying z = -11
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