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Simplifying -9(z + -9) = 10z Reorder the terms: -9(-9 + z) = 10z (-9 * -9 + z * -9) = 10z (81 + -9z) = 10z Solving 81 + -9z = 10z Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-10z' to each side of the equation. 81 + -9z + -10z = 10z + -10z Combine like terms: -9z + -10z = -19z 81 + -19z = 10z + -10z Combine like terms: 10z + -10z = 0 81 + -19z = 0 Add '-81' to each side of the equation. 81 + -81 + -19z = 0 + -81 Combine like terms: 81 + -81 = 0 0 + -19z = 0 + -81 -19z = 0 + -81 Combine like terms: 0 + -81 = -81 -19z = -81 Divide each side by '-19'. z = 4.263157895 Simplifying z = 4.263157895
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