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Simplifying -8(z + -8) = -9z Reorder the terms: -8(-8 + z) = -9z (-8 * -8 + z * -8) = -9z (64 + -8z) = -9z Solving 64 + -8z = -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. 64 + -8z + 9z = -9z + 9z Combine like terms: -8z + 9z = 1z 64 + 1z = -9z + 9z Combine like terms: -9z + 9z = 0 64 + 1z = 0 Add '-64' to each side of the equation. 64 + -64 + 1z = 0 + -64 Combine like terms: 64 + -64 = 0 0 + 1z = 0 + -64 1z = 0 + -64 Combine like terms: 0 + -64 = -64 1z = -64 Divide each side by '1'. z = -64 Simplifying z = -64
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