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Simplifying 9 + 7z = 9z + 13 Reorder the terms: 9 + 7z = 13 + 9z Solving 9 + 7z = 13 + 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. 9 + 7z + -9z = 13 + 9z + -9z Combine like terms: 7z + -9z = -2z 9 + -2z = 13 + 9z + -9z Combine like terms: 9z + -9z = 0 9 + -2z = 13 + 0 9 + -2z = 13 Add '-9' to each side of the equation. 9 + -9 + -2z = 13 + -9 Combine like terms: 9 + -9 = 0 0 + -2z = 13 + -9 -2z = 13 + -9 Combine like terms: 13 + -9 = 4 -2z = 4 Divide each side by '-2'. z = -2 Simplifying z = -2
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