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Simplifying -9z + 9z + 13z + -20z + 4 = 18 Reorder the terms: 4 + -9z + 9z + 13z + -20z = 18 Combine like terms: -9z + 9z = 0 4 + 0 + 13z + -20z = 18 4 + 13z + -20z = 18 Combine like terms: 13z + -20z = -7z 4 + -7z = 18 Solving 4 + -7z = 18 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + -7z = 18 + -4 Combine like terms: 4 + -4 = 0 0 + -7z = 18 + -4 -7z = 18 + -4 Combine like terms: 18 + -4 = 14 -7z = 14 Divide each side by '-7'. z = -2 Simplifying z = -2
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