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Simplifying 81 = -3(3z) Remove parenthesis around (3z) 81 = -3 * 3z Multiply -3 * 3 81 = -9z Solving 81 = -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. 81 + 9z = -9z + 9z Combine like terms: -9z + 9z = 0 81 + 9z = 0 Add '-81' to each side of the equation. 81 + -81 + 9z = 0 + -81 Combine like terms: 81 + -81 = 0 0 + 9z = 0 + -81 9z = 0 + -81 Combine like terms: 0 + -81 = -81 9z = -81 Divide each side by '9'. z = -9 Simplifying z = -9
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