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Simplifying 2(z + 9) = 12 Reorder the terms: 2(9 + z) = 12 (9 * 2 + z * 2) = 12 (18 + 2z) = 12 Solving 18 + 2z = 12 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-18' to each side of the equation. 18 + -18 + 2z = 12 + -18 Combine like terms: 18 + -18 = 0 0 + 2z = 12 + -18 2z = 12 + -18 Combine like terms: 12 + -18 = -6 2z = -6 Divide each side by '2'. z = -3 Simplifying z = -3
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