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Simplifying 72 = -9(-2 + -2z) 72 = (-2 * -9 + -2z * -9) 72 = (18 + 18z) Solving 72 = 18 + 18z Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-18z' to each side of the equation. 72 + -18z = 18 + 18z + -18z Combine like terms: 18z + -18z = 0 72 + -18z = 18 + 0 72 + -18z = 18 Add '-72' to each side of the equation. 72 + -72 + -18z = 18 + -72 Combine like terms: 72 + -72 = 0 0 + -18z = 18 + -72 -18z = 18 + -72 Combine like terms: 18 + -72 = -54 -18z = -54 Divide each side by '-18'. z = 3 Simplifying z = 3
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