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Simplifying 7z + 9 + 2z = 21 Reorder the terms: 9 + 7z + 2z = 21 Combine like terms: 7z + 2z = 9z 9 + 9z = 21 Solving 9 + 9z = 21 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + 9z = 21 + -9 Combine like terms: 9 + -9 = 0 0 + 9z = 21 + -9 9z = 21 + -9 Combine like terms: 21 + -9 = 12 9z = 12 Divide each side by '9'. z = 1.333333333 Simplifying z = 1.333333333
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