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Simplifying 3z + 9(z + 2) + -4 = 18 Reorder the terms: 3z + 9(2 + z) + -4 = 18 3z + (2 * 9 + z * 9) + -4 = 18 3z + (18 + 9z) + -4 = 18 Reorder the terms: 18 + -4 + 3z + 9z = 18 Combine like terms: 18 + -4 = 14 14 + 3z + 9z = 18 Combine like terms: 3z + 9z = 12z 14 + 12z = 18 Solving 14 + 12z = 18 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-14' to each side of the equation. 14 + -14 + 12z = 18 + -14 Combine like terms: 14 + -14 = 0 0 + 12z = 18 + -14 12z = 18 + -14 Combine like terms: 18 + -14 = 4 12z = 4 Divide each side by '12'. z = 0.3333333333 Simplifying z = 0.3333333333
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