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Simplifying -9(z + 2) = -10z Reorder the terms: -9(2 + z) = -10z (2 * -9 + z * -9) = -10z (-18 + -9z) = -10z Solving -18 + -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. -18 + -9z + 10z = -10z + 10z Combine like terms: -9z + 10z = 1z -18 + 1z = -10z + 10z Combine like terms: -10z + 10z = 0 -18 + 1z = 0 Add '18' to each side of the equation. -18 + 18 + 1z = 0 + 18 Combine like terms: -18 + 18 = 0 0 + 1z = 0 + 18 1z = 0 + 18 Combine like terms: 0 + 18 = 18 1z = 18 Divide each side by '1'. z = 18 Simplifying z = 18
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