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Simplifying 9z + 9 + -7z = 45 + -7z Reorder the terms: 9 + 9z + -7z = 45 + -7z Combine like terms: 9z + -7z = 2z 9 + 2z = 45 + -7z Solving 9 + 2z = 45 + -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 + 2z + 7z = 45 + -7z + 7z Combine like terms: 2z + 7z = 9z 9 + 9z = 45 + -7z + 7z Combine like terms: -7z + 7z = 0 9 + 9z = 45 + 0 9 + 9z = 45 Add '-9' to each side of the equation. 9 + -9 + 9z = 45 + -9 Combine like terms: 9 + -9 = 0 0 + 9z = 45 + -9 9z = 45 + -9 Combine like terms: 45 + -9 = 36 9z = 36 Divide each side by '9'. z = 4 Simplifying z = 4
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