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Simplifying -8z + -9 = -7z Reorder the terms: -9 + -8z = -7z Solving -9 + -8z = -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. -9 + -8z + 7z = -7z + 7z Combine like terms: -8z + 7z = -1z -9 + -1z = -7z + 7z Combine like terms: -7z + 7z = 0 -9 + -1z = 0 Add '9' to each side of the equation. -9 + 9 + -1z = 0 + 9 Combine like terms: -9 + 9 = 0 0 + -1z = 0 + 9 -1z = 0 + 9 Combine like terms: 0 + 9 = 9 -1z = 9 Divide each side by '-1'. z = -9 Simplifying z = -9
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