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Simplifying (2z + -9)(7 + 2) = 0 Reorder the terms: (-9 + 2z)(7 + 2) = 0 Combine like terms: 7 + 2 = 9 (-9 + 2z)(9) = 0 Reorder the terms for easier multiplication: 9(-9 + 2z) = 0 (-9 * 9 + 2z * 9) = 0 (-81 + 18z) = 0 Solving -81 + 18z = 0 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '81' to each side of the equation. -81 + 81 + 18z = 0 + 81 Combine like terms: -81 + 81 = 0 0 + 18z = 0 + 81 18z = 0 + 81 Combine like terms: 0 + 81 = 81 18z = 81 Divide each side by '18'. z = 4.5 Simplifying z = 4.5
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