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Simplifying -2z + -5 + 7z + 8 = -12 Reorder the terms: -5 + 8 + -2z + 7z = -12 Combine like terms: -5 + 8 = 3 3 + -2z + 7z = -12 Combine like terms: -2z + 7z = 5z 3 + 5z = -12 Solving 3 + 5z = -12 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 + 5z = -12 + -3 Combine like terms: 3 + -3 = 0 0 + 5z = -12 + -3 5z = -12 + -3 Combine like terms: -12 + -3 = -15 5z = -15 Divide each side by '5'. z = -3 Simplifying z = -3
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