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Simplifying -7z + 8 = -9z Reorder the terms: 8 + -7z = -9z Solving 8 + -7z = -9z Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '9z' to each side of the equation. 8 + -7z + 9z = -9z + 9z Combine like terms: -7z + 9z = 2z 8 + 2z = -9z + 9z Combine like terms: -9z + 9z = 0 8 + 2z = 0 Add '-8' to each side of the equation. 8 + -8 + 2z = 0 + -8 Combine like terms: 8 + -8 = 0 0 + 2z = 0 + -8 2z = 0 + -8 Combine like terms: 0 + -8 = -8 2z = -8 Divide each side by '2'. z = -4 Simplifying z = -4
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