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Simplifying 21z = 1.2z + -9 Reorder the terms: 21z = -9 + 1.2z Solving 21z = -9 + 1.2z Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-1.2z' to each side of the equation. 21z + -1.2z = -9 + 1.2z + -1.2z Combine like terms: 21z + -1.2z = 19.8z 19.8z = -9 + 1.2z + -1.2z Combine like terms: 1.2z + -1.2z = 0.0 19.8z = -9 + 0.0 19.8z = -9 Divide each side by '19.8'. z = -0.4545454545 Simplifying z = -0.4545454545
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