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Simplifying -2z + 3 + -5z = 18 Reorder the terms: 3 + -2z + -5z = 18 Combine like terms: -2z + -5z = -7z 3 + -7z = 18 Solving 3 + -7z = 18 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + -7z = 18 + -3 Combine like terms: 3 + -3 = 0 0 + -7z = 18 + -3 -7z = 18 + -3 Combine like terms: 18 + -3 = 15 -7z = 15 Divide each side by '-7'. z = -2.142857143 Simplifying z = -2.142857143
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