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Simplifying -7z + 8z = -9z + -7 + 2z Combine like terms: -7z + 8z = 1z 1z = -9z + -7 + 2z Reorder the terms: 1z = -7 + -9z + 2z Combine like terms: -9z + 2z = -7z 1z = -7 + -7z Solving 1z = -7 + -7z Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '7z' to each side of the equation. 1z + 7z = -7 + -7z + 7z Combine like terms: 1z + 7z = 8z 8z = -7 + -7z + 7z Combine like terms: -7z + 7z = 0 8z = -7 + 0 8z = -7 Divide each side by '8'. z = -0.875 Simplifying z = -0.875
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