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Simplifying 18 + 7 = 7z + 9z Combine like terms: 18 + 7 = 25 25 = 7z + 9z Combine like terms: 7z + 9z = 16z 25 = 16z Solving 25 = 16z Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-16z' to each side of the equation. 25 + -16z = 16z + -16z Combine like terms: 16z + -16z = 0 25 + -16z = 0 Add '-25' to each side of the equation. 25 + -25 + -16z = 0 + -25 Combine like terms: 25 + -25 = 0 0 + -16z = 0 + -25 -16z = 0 + -25 Combine like terms: 0 + -25 = -25 -16z = -25 Divide each side by '-16'. z = 1.5625 Simplifying z = 1.5625
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