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Simplifying 7z + 9 = 12z Reorder the terms: 9 + 7z = 12z Solving 9 + 7z = 12z Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-12z' to each side of the equation. 9 + 7z + -12z = 12z + -12z Combine like terms: 7z + -12z = -5z 9 + -5z = 12z + -12z Combine like terms: 12z + -12z = 0 9 + -5z = 0 Add '-9' to each side of the equation. 9 + -9 + -5z = 0 + -9 Combine like terms: 9 + -9 = 0 0 + -5z = 0 + -9 -5z = 0 + -9 Combine like terms: 0 + -9 = -9 -5z = -9 Divide each side by '-5'. z = 1.8 Simplifying z = 1.8
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