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Simplifying 13z + 3z + -7z + -9 = 18 Reorder the terms: -9 + 13z + 3z + -7z = 18 Combine like terms: 13z + 3z = 16z -9 + 16z + -7z = 18 Combine like terms: 16z + -7z = 9z -9 + 9z = 18 Solving -9 + 9z = 18 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 = 18 + 9 Combine like terms: -9 + 9 = 0 0 + 9z = 18 + 9 9z = 18 + 9 Combine like terms: 18 + 9 = 27 9z = 27 Divide each side by '9'. z = 3 Simplifying z = 3
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