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Simplifying 20 = 12 + -2z Solving 20 = 12 + -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. 20 + 2z = 12 + -2z + 2z Combine like terms: -2z + 2z = 0 20 + 2z = 12 + 0 20 + 2z = 12 Add '-20' to each side of the equation. 20 + -20 + 2z = 12 + -20 Combine like terms: 20 + -20 = 0 0 + 2z = 12 + -20 2z = 12 + -20 Combine like terms: 12 + -20 = -8 2z = -8 Divide each side by '2'. z = -4 Simplifying z = -4
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